NOTES ON BOREAL USTILAGINALES, II

1957 ◽  
Vol 35 (3) ◽  
pp. 279-286 ◽  
Author(s):  
D. B. O. Savile
Keyword(s):  
Fresh Material ◽  
Silene Acaulis ◽  
Cirsium Undulatum

Burrillia acori Dearn. is shown to be on Sparganium; it is apparently not a smut, but fresh material is needed for adequate study. Entyloma circaeae Dearn. is shown to be E. arnicale on Arnica affin. cordifolia. The following range or host extensions are recorded: Cintractia luzulae, Alaska; C. taubertiana, Que., N.B.; Doassansia epilobii, B.C.; D. martianoffiana, B.C.; D. sagittariae, B.C.; Entyloma clintonianum, B.C.; E. compositarum, Labr.; E. winteri on Delphinium brownii, Alta., B.C.; Thecaphora deformans, Alta., Sask.; Thecaphora traillii on Cirsium undulatum, B.C.; Urocystis anemones on Ranunculus cooleyae and R. eschschollzii, B.C.; U. sorosporioides on Aconitum delphinifolium, B.C.; U. heucherae on Saxifraga tolmici, B.C.; Ustilago bullata on Browns ciliatus, Que.; U. tenuispora on Polygonum hydropiperoides, Ont., and P. punctatum, N.Y.; U. violacea vars. on Arenaria lateriflora, B.C. and Ont., on Lychnis triflora, Ellesmere I., on Silene acaulis vars., Spitzbergen, B.C., and Que., on S. douglasii var. villosa, B.C.; Ustilago pinguiculae on Pinguicula villosa, Man., on P. vulgaris, B.C., Alta., and Ont.

scholarly journals Cushion plant morphology controls biogenic capability and facilitation effects of Silene acaulis along an elevation gradient

2015 ◽  
Vol 30 (7) ◽  
pp. 1216-1226 ◽  
Author(s):  
Giuliano Bonanomi ◽  
Adriano Stinca ◽  
Giovanni Battista Chirico ◽  
Giampiero Ciaschetti ◽  
Antonio Saracino ◽  
...  
Keyword(s):  
Elevation Gradient ◽  
Plant Morphology ◽  
Cushion Plant ◽  
Silene Acaulis

Lxxix: Conrad's Revision of “the Lighthouse” in Nostromo

PMLA ◽  
1937 ◽  
Vol 52 (4) ◽  
pp. 1183-1190
Author(s):  
George W. Whiting
Keyword(s):  
Dead Wood ◽  
The Other ◽  
Final Version ◽  
Fresh Material ◽  
The Dead ◽  
To Come ◽  
The One ◽  
Consummate Skill

To the student of writing and literature few inquiries are more interesting and valuable than that into an author's practices in revising his own work. To observe the various stages in the evolution of the final version, to note carefully an artist at his work of pruning the dead wood, adding fresh material, smoothing away harsh phrases, selecting just words, and letting light into obscure places—to do this is to come somewhat nearer to an understanding of what in spite of all analysis will remain essentially a mystery. Especially fascinating and instructive is the study of Conrad's revision, for here one sees a supreme artist at work. In his vigorous hewing and rebuilding there is conclusive proof of the artist's untiring industry and consummate skill. Conrad's revision of Nostromo is of particular interest, for this novel occupies a critical place in the evolution of Conrad's prose. Mr. Richard Curie has justly characterized the change that came over Conrad's prose—a change perceptible in the “Amy Foster” of Typhoon and fully marked in from Under Western Eyes onward. This evolution has smoothed away the cadence, has concentrated the manner, has toned down the style of Conrad's former exuberance. At first glance the later and the earlier Conrad appear two totally different men. The unruly splendor of the one has given way to the subtle and elastic suavity of the other … His earlier prose is sometimes uncertain, sometimes exaggerated, but his later prose has the uniform temper of absolute mastery.

CYTOTAXONOMY, PHYLOGENY, AND CANADIAN DISTRIBUTION OF CIRSIUM UNDULATUM AND CIRSIUM FLODMANII

1961 ◽  
Vol 39 (1) ◽  
pp. 21-33 ◽  
Author(s):  
C. Frankton ◽  
R. J. Moore
Keyword(s):  
North American ◽  
Chromosome Numbers ◽  
World Wide ◽  
North American Species ◽  
Base Number ◽  
Total Length ◽  
The World ◽  
Cirsium Undulatum

The morphology and specific differences of Cirsium undulatum (Nutt.) Spreng. and of C. flodmanii (Rydb.) Arthur are described and their Canadian distributions are reported in detail. The chromosome numbers are C. undulatum f. undulatum and f. album Farwell, 2n = 26; C. flodmanii f. flodmanii and f. albiflorum D. Löve, 2n = 22. The origin of four North American species of Cirsium that do not follow the world-wide base number 17 is discussed; it is postulated that reduction in number has occurred by translocations. The chromosomes of species with reduced numbers are larger than those of the unreduced species but the total length of the chromosomes of both groups is approximately the same.

scholarly journals Checklist of the non-lichenised fungi of Fair Isle, Scotland

2021 ◽  
Vol 27 (3) ◽  
pp. 28-41
Author(s):  
R. Watling ◽  
N.J. Riddiford
Keyword(s):  
British Isles ◽  
Abundance Distribution ◽  
Fresh Material ◽  
Salix Herbacea

A taxonomic list of the non-lichenised fungi recorded for Fair Isle is given. The total comprises 260 taxa: 251 verified species and 9 additional intraspecific variants. Several other entities remain provisional until fresh material is available. The list is annotated with summary details of abundance, distribution, habitat, phenology and, for notable species, their wider status within Britain. Four species are new citations for the British Isles. The list demonstrates the island’s regional, national, international and conservation importance, particularly for grassland taxa and montane fungi associated with dwarf willow (Salix herbacea).

scholarly journals Optimizing mitochondrial maintenance in extended neuronal projections

2021 ◽  
Vol 17 (6) ◽  
pp. e1009073
Author(s):  
Anamika Agrawal ◽  
Elena F. Koslover
Keyword(s):  
Steady State ◽  
Neurodegenerative Disorders ◽  
Quantitative Model ◽  
Organelle Transport ◽  
Optimal Distribution ◽  
Metabolic Demand ◽  
Mitochondrial Homeostasis ◽  
Fresh Material ◽  
New Material ◽  
High Metabolic Demand

Neurons rely on localized mitochondria to fulfill spatially heterogeneous metabolic demands. Mitochondrial aging occurs on timescales shorter than the neuronal lifespan, necessitating transport of fresh material from the soma. Maintaining an optimal distribution of healthy mitochondria requires an interplay between a stationary pool localized to sites of high metabolic demand and a motile pool capable of delivering new material. Interchange between these pools can occur via transient fusion / fission events or by halting and restarting entire mitochondria. Our quantitative model of neuronal mitostasis identifies key parameters that govern steady-state mitochondrial health at discrete locations. Very infrequent exchange between stationary and motile pools optimizes this system. Exchange via transient fusion allows for robust maintenance, which can be further improved by selective recycling through mitophagy. These results provide a framework for quantifying how perturbations in organelle transport and interactions affect mitochondrial homeostasis in neurons, a key aspect underlying many neurodegenerative disorders.

scholarly journals Stigmatic surface in the Vochysiaceae: reproductive and taxonomic implications

2009 ◽  
Vol 23 (3) ◽  
pp. 780-785 ◽  
Author(s):  
Renata Carmo-Oliveira ◽  
Berta Lange de Morretes
Keyword(s):  
Histological Analysis ◽  
Developmental Stages ◽  
Phylogenetic Reconstruction ◽  
Breeding Systems ◽  
Stigmatic Surface ◽  
Central Brazil ◽  
Fresh Material ◽  
The Family ◽  
Taxonomic Implications ◽  
Trees And Shrubs

The Vochysiaceae are Neotropical trees and shrubs, common in the savanna areas in Central Brazil (Cerrados). The family has been traditionally divided into two tribes: Erismeae, with three genera, and Vochysieae, with five genera. We investigated the stigmatic surface of six Vochysiaceae species, belonging to four genera of Vochysieae: Vochysia, Salvertia, Callisthene and Qualea. Flowers and buds at different developmental stages were collected. Morphological features were observed on fresh material and stigmatic receptivity was inferred based on esterasic activity. Pistils were fixed and embedded in paraplast and sectioned on a rotary microtome; the sections were stained before histological analysis. Stigmas of open flowers were also observed by scanning electron microscopy. Stigmas of all species were wet and showed esterasic activity at pre-anthesis and anthesis stages. Stigmatic surface was continuous with transmitting tissue of glandular nature. Vochysia and Salvertia stigmatic surfaces were formed by multicelular uniseriate hairs, and species of the remaining genera showed papillate surface. The exudate over mature stigmas in all species flowed without rupture of stigmatic surface and pollen tubes grew down between hairs or papillae. Differences on the stigmatic surface agreed with a phylogenetic reconstruction that separated two clades and indicated that Vochysieae is not monophyletic. Stigmatic features could not be associated with pollination and breeding systems.

scholarly journals Unusually low genetic divergence at COI barcode locus between two species of intertidalThalassaphorura(Collembola: Onychiuridae)

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5021 ◽  
Author(s):  
Xin Sun ◽  
Anne Bedos ◽  
Louis Deharveng
Keyword(s):  
Genetic Divergence ◽  
Dna Barcode ◽  
Intertidal Habitat ◽  
Species Classification ◽  
Arthropod Species ◽  
Fresh Material ◽  
Interspecific Divergence ◽  
Collembolan Species ◽  
Morphological Differences ◽  
Intertidal Ecosystems

Species classification is challenging when taxa display limited morphological differences. In this paper, we combined morphology and DNA barcode data to investigate the complicated taxonomy of two Onychiurid Collembolan species.Thalassaphorura thalassophilaandThalassaphorura debilisare among the most common arthropod species in intertidal ecosystems and are often considered to be synonymous. Based on morphological and barcode analyses of fresh material collected in their type localities, we redescribed and compared the two species. However, their morphological distinctiveness was supported by a molecular divergence much smaller than previously reported at the interspecific level among Collembola. This divergence was even smaller than inter-population divergences recognized in the related edaphic speciesT. zschokkei, as well as those known between MOTUs within many Collembolan species. Our results may indicate a link between low genetic interspecific divergence and intertidal habitat, as the only biological peculiarity of the two species of interest compared to other Collembolan species analyzed to date is their strict intertidal life.

Use of P32 in Tracing Some Insect-Plant Reltionships of the Thistle, Cirsium Undulatum

Ecology ◽  
1954 ◽  
Vol 35 (2) ◽  
pp. 187-191 ◽  
Author(s):  
Robert C. Pendelton ◽  
Albert W. Grundmann
Keyword(s):  
Cirsium Undulatum
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