Reexamination of six taxa described in Leptosphaeria from species in the Ranunculaceae

1995 ◽  
Vol 73 (4) ◽  
pp. 573-582 ◽  
Author(s):  
Young-mee Ahn ◽  
C. A. Shearer
Keyword(s):  
Key Words ◽  
Plant Species ◽  
New Genus ◽  
Fungal Species ◽  
Taxonomic Position ◽  
Original Position ◽  
Authentic Materials

Six fungal species previously placed in Leptosphaeria and originally described on plant species in the Ranunculaceae were reevaluated for their proper taxonomic position and redescribed and illustrated from the type and authentic materials. The original position of Leptosphaeria nigromaculata as Ophiobolus nigromaculata is confirmed. Metasphaeria rupicola is transferred to Massarina, and a lectotype is designated. Leptosphaeria scotophila and Leptosphaeria thorae are transferred to Phaeosphaeria, and a lectotype is designated for L. scotophila. The previous transfer of Leptosphaeria anthostomoides to Montagnula anthostomoides is confirmed. The new genus Barrella is established and typified by Leptosphaeria thalictri, and a neotype is designated. Key words: systematics, Loculoascomycetes, Leptosphaeria.

Precise flagellar configuration of the Rhizophlyctis harderi zoospore

1992 ◽  
Vol 70 (4) ◽  
pp. 762-771 ◽  
Author(s):  
Sonali Roychoudhury ◽  
Martha J. Powell
Keyword(s):  
Key Words ◽  
New Genus ◽  
Flagellar Apparatus ◽  
The Other ◽  
Taxonomic Position ◽  
Serial Sections ◽  
Microtubular Roots

Rhizophlyctis harder is a questionable member of the genus Rhizophlyctis, and more stable and reliable characters are needed to establish the taxonomic position of this chytrid. As a source of such characters the flagellar apparatus of zoospores of R. harderi was reconstructed from serial sections, and the precise configuration was determined. The flagellar apparatus included two major microtubular roots, each with separate points of origin near the kinetosome. Root A extended laterally from one side of the kinetosome toward and around one rumposome and then continued anteriorly. The other, root B, originated between the kinetosome and secondary centriole near fibrillar connecting material and projected anteriorly into the cytoplasm. Each of these two major roots branched into two rootlets. This system of microtubular roots is more complex than that found in the flagellar apparatus of other Chytridiomycetes presently described. The structure of the flagellar apparatus and accompanying roots clearly separates this species from others in the genus Rhizophlyctis and indicates that it can be used to establish a new genus in the Chytridiales. Key words: Rhizophlyctis harderi, Chytridiales, zoospores, flagellar apparatus, ultrastructure.

Applanodictyosporous Pleosporales: Clathrospora, Comoclathris, GraphyIlium, Macrospora, and Platysporoides

1992 ◽  
Vol 70 (8) ◽  
pp. 1617-1658 ◽  
Author(s):  
R. A. Shoemaker ◽  
C. E. Babcock
Keyword(s):  
Key Words ◽  
New Genus ◽  
New Family ◽  
The Family

Six genera of the order Pleosporales are revised taxonomically. Although five genera have unusual applanate ascospores, they are members of three different families. Clathrospora (10 species, 2 new), Comoclathris (21 species, 7 new), and Macrospora (3 species) are placed in a new family Diademaceae in which the ascoma opening is a characteristic flat circular lid. Diademosa, a new genus with one species with terete ascospores is placed in Diademaceae. Graphyllium (3 species) is placed in the family Hysteriaceae characterized by hysterothecia with a slit-like opening. Platysporoides n.gen. (11 species, 1 new) is maintained in the Pleosporaceae because of the terete pored beak of the ascomata. Key words: Pleosporales, applanate ascospores, Clathrospora, Comoclathris, Macrospora, Diademosa, Graphyllium, Platysporoides.

Two Way Indicator Species Analysis (TWINSPAN) of the Herbaceous Vegetation in an Inland Wetland Ecosystem of Doon Valley Himalaya, India

1970 ◽  
Vol 3 ◽  
pp. 23-31 ◽  
Author(s):  
R. K. Manhas ◽  
M. K. Gautam ◽  
Deepa Kumari
Keyword(s):  
Soil Moisture ◽  
Key Words ◽  
Plant Species ◽  
Indicator Species ◽  
Indigenous Species ◽  
Indicator Species Analysis ◽  
Wetland Ecosystem ◽  
Herbaceous Vegetation ◽  
Doon Valley ◽  
Species Analysis

In swamp distribution, dominance and survival of a species is very much governed by the soil moisture and period of flooding. The present study was conducted to classify the communities and plant species, and to have an idea about various associations of plants present in the swamp with respect to soil moisture. Two way indicator species analysis (TWINSPAN) classified the communities into four and plant species into eleven groups. The communities with least soil moisture were the first to be segregated and with highest soil moisture last. Similarly, the species growing in drier condition was clustered separately from the moisture loving indigenous species. Key words: TWINSPAN; vegetation; inland wetland; India DOI: 10.3126/jowe.v3i0.2433 Journal of Wetlands Ecology, (2009) Vol. 3, pp 23-31

Lower limit of available water for three plant species grown on a medium-textured soil in southwestern Saskatchewan

1991 ◽  
Vol 71 (2) ◽  
pp. 247-252 ◽  
Author(s):  
H. W. Cutforth ◽  
P. G. Jefferson ◽  
C. A. Campbell
Keyword(s):  
Key Words ◽  
Lower Limit ◽  
Plant Species ◽  
Spring Wheat ◽  
Soil Factors ◽  
Available Water ◽  
Water Potentials ◽  
Lower Limits ◽  
Water Contents

Numerous researchers estimate and report laboratory-determined lower limit of available water contents using −1.5 MPa water potentials. For medium-textured soils, laboratory-measured lower limits should be determined at potentials of at least −4 MPa, and possibly −10 MPa, when using pressure membrane procedures. However, because the lower limit of available water is dependent upon environmental, plant and soil factors, we agree with Ratliff et al. (1983) that field-measured lower limits are preferable to laboratory-measured lower limits. Field-measured lower limits of available water did not vary markedly between spring wheat, alfalfa and grass. Key words: Lower limit of available water, wheat, alfalfa, grass

Interspecific differences in the tolerance of arbuscular mycorrhizal fungi to freezing and drying

2001 ◽  
Vol 79 (10) ◽  
pp. 1161-1166 ◽  
Author(s):  
John N Klironomos ◽  
Miranda M Hart ◽  
Jane E Gurney ◽  
Peter Moutoglis
Keyword(s):  
Arbuscular Mycorrhizal Fungi ◽  
Plant Species ◽  
Mycorrhizal Fungi ◽  
Arbuscular Mycorrhizal ◽  
Fungal Species ◽  
Drought Treatment ◽  
Interspecific Differences ◽  
The Difference ◽  
One Year ◽  
Arbuscular Mycorrhizal Fungal

Arbuscular mycorrhizal fungal communities in northern temperate ecosystems must function during extremes in environmental conditions. However, it is not known if arbuscular mycorrhizal fungi that co-exist in soil communities have similar tolerances to stresses such as drought and freezing. The phenology of arbuscular mycorrhizal fungi was determined over one year in a community in southern Ontario, Canada. Five fungal species from the same community were then used to inoculate five plant species, in all possible combinations, and were subjected to either a freezing treatment or a drought treatment after which new seedlings were transplanted into the treated pots. The percent colonization of roots of each plant species was measured as the difference in mean colonization from the control. Freezing reduced percent colonization in almost every case, whereas drought resulted in both increased and decreased percent colonization. Fungal species responded differently to the treatments, and there was a pronounced plant × fungus effect. These results support the hypothesis that distinct functional groups of arbuscular mycorrhizal fungi exist, and these may determine plant community structure.Key words: arbuscular mycorrhizal fungi, freezing, drying, functional diversity.

Enumeration of Plant Species Inhabiting Oil Palm Trees (Elaeis-guineensis) at Zawlpui Plantation Site, Serchhip District, Mizoram

2021 ◽  
Vol 9 (1) ◽  
pp. 32-35
Author(s):  
Lal awmpuia ◽  
◽  
H. Lalruatsanga ◽  
Keyword(s):  
Species Diversity ◽  
Plant Species ◽  
Oil Palm ◽  
Elaeis Guineensis ◽  
Vascular Plant ◽  
Fungal Species ◽  
Small Scale ◽  
Palm Tree ◽  
Palm Trees ◽  
Plant Stem

A survey of plant species inhabiting oil palm trees was conducted in Zawlpui area of Serchhip district, Mizoram. The study area is a tropical potent agriculture zone, wherein small-scale business of Elaeis guineensis plantation is carried out by several farmers mainly within the gentle sloppy terrain. Oil palm with a rough bark harbors immense inhabitation by a variety plants, that rooted mostly on the debris at leaf base. Species diversity on the plant stem supposedly encourage insects and termites to establish herewith, thus causing harming to the tree. The sample stands within 400 m–800 m altitude were picked randomly. A total of 50 palm tree were accounted and all associated plants on the stem above 30 cm from the ground are all recorded. Species that cannot be identified on the site were pressed and observed at Botany Research lab, Pachhunga University College. The survey documented 38 vascular plant species which include 4 epiphytes and 1 non-vascular species of lichen, 1 bryophyte and 4 fungal species at that time. Invasive Peperomia pellucida and epiphytic pteridophytes Nephrolepis biserrata was found in most of the stand sample; however, Peperomia population decreases with the increasing elevation. Dynamics of inhabitant species diversity also correlate to location of tree. The study also established that diversity of inhabiting species was comparatively high on parts of the stem facing sunlight.

scholarly journals Chlorophytum nepalense (Lindley) Baker (Liliaceae) - A new angiospermic record for Bangladesh

1970 ◽  
Vol 37 (2) ◽  
pp. 193-194 ◽  
Author(s):  
Sumona Afroz ◽  
Ershad Tutul ◽  
Mohammad Zashim Uddin ◽  
Md Abul Hassan
Keyword(s):  
Key Words ◽  
New Record ◽  
New Genus ◽  
Perennial Herb ◽  
New Genus And Species ◽  
The Family

Chlorophytum nepalense (Lindley) Baker, a perennial herb, belonging to the family Liliaceae has been described and illustrated as a new genus and species record for Bangladesh. Key words: Chlorophytum nepalense, New record, Bangladesh doi:10.3329/bjb.v37i2.1730 Bangladesh J. Bot. 37(2): 193-194, 2008 (December)

An enigmatic new genus of cyclostome braconid wasp (Hymenoptera: Braconidae) from New Zealand

Zootaxa ◽  
2018 ◽  
Vol 4403 (3) ◽  
pp. 594 ◽  
Author(s):  
SERGEY A. BELOKOBYLSKIJ
Keyword(s):  
New Zealand ◽  
Type Species ◽  
New Genus ◽  
Taxonomic Position ◽  
Braconid Wasp

A new enigmatic genus perhaps belonging to the braconid wasp subfamily Pambolinae, Zeachremylus gen. nov. (type species Z. wardi sp. nov.), is described from New Zealand. The taxonomic position of this new genus is discussed. 

Extreme reduction of morphological characters: a type of brachidial development found in several Late Cretaceous and Recent brachiopod species—new relationships between taxa previously listed as incertae sedis

Zootaxa ◽  
2018 ◽  
Vol 4444 (1) ◽  
pp. 1 ◽  
Author(s):  
ERIC SIMON ◽  
BERNARD MOTTEQUIN
Keyword(s):  
Late Cretaceous ◽  
New Genus ◽  
Morphological Characters ◽  
Size Reduction ◽  
Taxonomic Position ◽  
Incertae Sedis ◽  
New Family

Size reduction and development of a simplified brachidial structure occurred several times during the long evolution of the Phylum Brachiopoda. Even Recent forms may be micromorphic and paedomorphic with reduced brachidia or none at all. A revision of the Maastrichtian (Late Cretaceous) Terebratella (Morrisia?) suessi Bosquet, 1859 has allowed us to erect a new genus, Jagtithyris gen. nov., because its singular brachidium development does not match any platidiid structure. Such a brachidium has also been observed in another European Late Cretaceous brachiopod, which indicates that this type was not a unique morphological curiosity. This species is the micromorphic Campanian-Maastrichtian Leptothyrellopsis polonicus Bitner & Pisera, 1979, which has brachidial structures in common with Jagtithyris suessi comb. nov., although a number of differences have been observed. The genera Leptothyrellopsis and Jagtithyris gen. nov., are included in a new family, Jagtithyrididae fam. nov. During an ongoing revision of extant brachiopod faunas we have been led to recognize a link between this family and representatives of the genus Simplicithyris Zezina, 1976. The taxonomic position of this peculiar group is also discussed. 

A new stegelytrine leafhopper genus from China and Thailand (Hemiptera: Cicadellidae)

Zootaxa ◽  
2006 ◽  
Vol 1333 (1) ◽  
pp. 55 ◽  
Author(s):  
YALIN ZHANG ◽  
CONG WEI ◽  
M. D. WEBB
Keyword(s):  
New Species ◽  
Type Species ◽  
New Genus ◽  
Taxonomic Position ◽  
Related Genus ◽  
Two New Species

A new Oriental stegelytrine leafhopper genus, Wyuchiva, and two new species, Wyuchiva elegantula (type species) from Thailand and Wyuchiva menglaensis from China, are described and illustrated. The taxonomic position of the new genus is discussed and phylogenetic remarks on this and a related genus, Temburocera Webb, 1999, are given.

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