ISSN:0027-5514    

DOI:10.1080/00275514.1943.12017458

出版商:Taylor&Francis    

年代:1943

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1943.12017459

出版商:Taylor&Francis    

年代:1943

数据来源: Taylor

摘要:

SUMMARY1.Studies were made of 14 cultures ofColletotrichum destructivumwith respect to the loss of sporulation.2.Variant types were isolated from sectors and patches in old cultures which differed from the original in various cultural characters. Some produced very few spores while others produced many more spores than the original cultures from which they came.3.The original cultures retained their ability to sporulate through 10 successive single spore generations. Transfers to sterile host tissue and to the living host did not cause poorly sporulating cultures to regain their ability to sporulate heavily.4.Two variants were obtained from lesions on red clover seedlings produced under sterile conditions.5.Conidia were predominantly uni-nucleate, a few being found which were bi-nucleate.6.It is concluded that the loss of sporulation in cultures was due to the occurrence of poorly sporulating types genetically different from the original type which they replaced.

ISSN:0027-5514    

DOI:10.1080/00275514.1943.12017460

出版商:Taylor&Francis    

年代:1943

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1943.12017461

出版商:Taylor&Francis    

年代:1943

数据来源: Taylor

摘要:

SUMMARYBasidia of many Polyporaceae at the end of the rainy season and during intervals between two showers of rain have been observed to be gradually transformed into hyphal elongations with terminal spores that are exactly like basidiospores. Conversely, on the advent of rain in the middle of a dry season, the hyphal elongations soon become reconverted into regular basidia.Such conversion has been reproduced under experimental conditions. When a piece of the fruitbody of a thin and desiccated specimen was placed under the running water of a laboratory-tap overnight, the hyphal elongations entirely disappeared from the pore-tubes and the majority of the pore-tubes developed mature basidia with sterigmata and spores. When a piece of the same fruitbody was stuck to the lid of a moist agar-plate and examined daily under the microscope, it was found that, as the water of condensation gradually disappeared from the plate in the course of three or four days and the plate became comparatively dry (the relative humidity becoming reduced to about 85 per cent), the pore-tubes displayed a development of a large number of clamped and elongated hyphae with terminal spores and a few abnormal elongated narrower basidia. The experiment was repeated several times and sometimes in reverse order, and in each case the same result was obtained. Such experimental conversion was quite successful with thin and easily desiccated specimens ofPolyporus, Polystictus, andTrametes.It did not succeed well with very thick or soft specimens ofPolyporus, Trametes, Lenzites, Daedalea, Fomes, etc., as it is known that all specimens cannot withstand desiccation to the same degree. This experiment confirms my observation that it is mainly the water-relation which controls the transformation of basidia into hyphal elongations with clamp- connexions and terminal spores andvice versa.None of the previous workers (Patouillard, Matruchot, and Heim) have correlated this change of form of basidia with the varying external conditions.In some specimens ofGanoderma lucidumcollected in 1937 and 1938, brown thick-walled basidia resembling those described by Heim inPodaxis indicusandPodaxis aegyptiacusunder the name ofpseudobasidia, were found in the hymenial layer.

ISSN:0027-5514    

DOI:10.1080/00275514.1943.12017462

出版商:Taylor&Francis    

年代:1943

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1943.12017463

出版商:Taylor&Francis    

年代:1943

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1943.12017464

出版商:Taylor&Francis    

年代:1943

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1943.12017465

出版商:Taylor&Francis    

年代:1943

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1943.12017466

出版商:Taylor&Francis    

年代:1943

数据来源: Taylor

ISSN:0027-5514    

DOI:10.1080/00275514.1943.12017467

出版商:Taylor&Francis    

年代:1943

数据来源: Taylor