ISSN:0027-5514    

DOI:10.1080/00275514.1941.12020852

出版商:Taylor&Francis    

年代:1941

数据来源: Taylor

摘要:

SUMMARYMarked differences in the characters ordinarily used in taxonomy are revealed when 10 strains of 3 species (F. Solani, F. oxysporumandF. avenaceum), representing 3 sections of the genusFusarium, are grown in light, and in darkness.The quality of the colony and morphologic characters were affected, as were also the quantity and to a certain degree the occurrence of such characters as perithecial primordia.Evidence is given which indicates that the effect of light is produced on that portion of the thallus which is actively growing at the time of exposure. Single spore cultures subjected to light only for the first 4 days of growth, fail to develop in the same manner as those allowed to remain in light.It is concluded that such characters as color, zonation, type of colony, presence or absence of sporodochia; size, shape and septation of macroconidia; and even the occurrence of a perithecial stage, can not be employed successfully in taxonomy unless these fungi are grown in adequate light.

ISSN:0027-5514    

DOI:10.1080/00275514.1941.12020853

出版商:Taylor&Francis    

年代:1941

数据来源: Taylor

摘要:

SUMMARYThe activity of the primary and secondary zoöspores in four genera of the Saprolegniaceae was studied and compared at temperatures from 5°to 35°C. Under carefully controlled conditions, primary zoöspores, for example, swarmed for a shorter period, carried on normal activity over a narrower temperature range, moved at a slower rate, and had a higher temperature coefficient than the secondary. Since the two types have different“temperature characteristics,”their activities are probably controlled by different catalysts.

ISSN:0027-5514    

DOI:10.1080/00275514.1941.12020854

出版商:Taylor&Francis    

年代:1941

数据来源: Taylor

摘要:

SUMMARY1.The apothecia ofThelotrema interpositumarise from a group of ascogonial coils, each of which is provided with a trichogyne. This initial is similar to that which has been described in many lichen groups.2.Spermatium-like bodies have been found attached to the“paraphyses”of some of the apothecia. These are unusual in their nature and place of occurrence, but they seem best interpreted either as asexual spores or (more probably) as spermatia. There is some evidence that they may fuse with the trichogyne.3.Asci are formed from ascogenous hyphae, apparently through typical croziers. The asci first grow in length and the sheathing membrane may not appear until a later stage. After division of the definitive nucleus, one of the resulting nuclei is delimited in a small unit of the epiplasm by a very distinct membrane and this spore initial grows to fill the ascus. Most asci contain some puzzling chromatin-like material.

ISSN:0027-5514    

DOI:10.1080/00275514.1941.12020855

出版商:Taylor&Francis    

年代:1941

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1941.12020856

出版商:Taylor&Francis    

年代:1941

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1941.12020857

出版商:Taylor&Francis    

年代:1941

数据来源: Taylor

摘要:

SUMMARY1.A new species ofCladochytriumhas been isolated in uni-fungal culture on dechlorophyllized corn leaves and non-water-proof cellophane, and in pure culture on 0.5 and 3 per cent plain agar.2.The development and structure of the fungus has been described.3.The specific namecrassumhas been proposed for this new species because of its coarse rhizomycelium.

ISSN:0027-5514    

DOI:10.1080/00275514.1941.12020858

出版商:Taylor&Francis    

年代:1941

数据来源: Taylor

摘要:

SUMMARYA new species ofDictyosteliumisolated from forest litter is described. Because of the diminutive character of its sorocarps the nameD. minutumis proposed.In the size and pattern of its spores and in the behavior of its vegetative myxamoebae in culture, the species closely resembles D.mucoroides.It is distinguished from this species primarily by the conspicuously smaller dimensions of its pseudoplasmodia and sorocarps and secondarily by the pattern of its completed fructifications. In thin cultures under optimum environmental conditions, radiate pseudoplasmodia appear, but they are not formed as consistently as in the larger species. Mature sorocarps are diminutive and unsubstantial. Typically they consist of short, thin, tapering sorophores bearing comparatively large, colorless to milk-white sori. Normally the sorophore consists of a single tier of cells throughout the greater portion of its length, the individual cells varying in shape from flattened and discoid toward the base to elongate and tube-like at the apex. Branched sorocarps are more common than in any other species ofDictyostelium.

ISSN:0027-5514    

DOI:10.1080/00275514.1941.12020859

出版商:Taylor&Francis    

年代:1941

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1941.12020860

出版商:Taylor&Francis    

年代:1941

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1941.12020861

出版商:Taylor&Francis    

年代:1941

数据来源: Taylor