摘要:

Oidiodendron nigrumRobak was recorded for the first time from soil. The method of conidial production was examined and it was found that thick-walled endospores were produced within the parental hyphal walls rather than a simple fragmenting and rounding-off of sporiferous hyphae. An isolate ofHelicodendron tubulosumfrom soil was found to differ from previously described isolates in the production of a second phialospore-type conidial stage and in the ability of mature helicoid spores to fragment at maturity into a number of smaller functional units. Isolates corresponding toStachybotrys cylindrosporaJensen were examined and found to be distinct fromStachybotrys atrawith which it had previously been regarded as synonymous.

ISSN:0008-4026    

DOI:10.1139/b61-136

出版商:NRC Research Press    

年代:1961

数据来源: NRC

摘要:

Monocillium humicolais described as a new hyphomycete and compared withMonocillium indicum, the type. The relationships betweenMonocilliumand reduced forms ofPaecilomycesare discussed.Paecilomyces variabilisis described as a new species from soil which has a reduced conidiophore apparatus consisting largely of sessile phialides; it produces an antibiotic active against both Gram-positive and Gram-negative bacteria but not against fungi.

ISSN:0008-4026    

DOI:10.1139/b61-137

出版商:NRC Research Press    

年代:1961

数据来源: NRC

摘要:

Water and acetone extracts of balsam fir, black spruce, white spruce, and red spruce have been shown to be stimulatory to the growth of an isolate ofPhialophora fastigiatawhen added to a complete basal medium. Fractionation of the extracts has shown that the woods differ in the nature of their stimulatory substance or substances. Biotin was indicated as the active compound in some of the fractions. The number and nature of the other substances are as yet unknown.

ISSN:0008-4026    

DOI:10.1139/b61-138

出版商:NRC Research Press    

年代:1961

数据来源: NRC

摘要:

Electrical resistances of living shoots of 13 apple rootstocks varying in vigor from very dwarfing to very vigorous were measured. A portable, battery-powered Bouyoucos Model C bridge was used, equipped with needle electrode probes that completely penetrated the bark. Data obtained on shoots of the previous year's growth revealed a direct relationship between the electrical resistance of shoots and the known rootstock effect on scion vigor. Dwarfing and vigorous rootstocks had low and high electrical resistance respectively. When resistance was plotted against time there was a close resemblance to curves for daily periodicity of transpiration.

ISSN:0008-4026    

DOI:10.1139/b61-139

出版商:NRC Research Press    

年代:1961

数据来源: NRC

摘要:

Isolates ofAscochyta imperfectawhich had reacted differentially to 10 leguminous hosts were grown on a basic medium amended with various sugars, amino acids, and nitrogen sources. Significant differences in the yield of mycelium on the various media showed that these isolates responded specifically to different sugars and amino acids. Among the latter, cystine at 0.025% was inhibitory to all isolates. The significance of changes in the host on development of the fungus is discussed.

ISSN:0008-4026    

DOI:10.1139/b61-140

出版商:NRC Research Press    

年代:1961

数据来源: NRC

摘要:

The accumulation of radioactivity from carbon-14 dioxide assimilation at infection sites ofUromyces phaseoliwas studied. The accumulated radioactivity was found to reside essentially in starch, which has been clearly demonstrated in this study to be the result ofde novosynthesis from carbon-14 dioxide at the infection site and not due to an enhanced translocation of photosynthates from non-infected leaf areas and subsequent starch synthesis.It was also shown thatU. phaseoliinduced an increase in the chlorophyll content of the host tissue located at the periphery of the rust colony as it developed, and a concomitant increase in starch accumulation.Unlike the ‘green island' induced by powdery mildew in wheat leaves reported by Allen, the 'green island' induced byU. phaseoliin bean leaves is the result of pigment retention in the host tissue within the domain of influence of the parasite. The chlorophyll in the 'green island' was found to be photosynthetically active. Results from experiments of photosynthesis with 'green islands' provided the unequivocal evidence to support the idea ofde novosynthesis of starch at the sites of rust infection.

ISSN:0008-4026    

DOI:10.1139/b61-141

出版商:NRC Research Press    

年代:1961

数据来源: NRC

摘要:

The nuclear behavior in the life cycle ofAscocybe grovesiiis described. The chromosome number is given as six from counts made of chromosomes in the meiotic divisions in the asci. The ascophores are described as diploid, and as a consequence there is no fusion of nuclei in the asci.

ISSN:0008-4026    

DOI:10.1139/b61-142

出版商:NRC Research Press    

年代:1961

数据来源: NRC

摘要:

Descriptions are given of 14 species ofMicroascus. M. pyramidusBarron and Gilman is described as a new species andM. trigonosporusvar.macrosporusOrr as a new variety. The conidial stage and cultural characteristics are described for most of the species. The genusMicroascusis separated fromPetriellaon the basis of the smaller, lighter-colored ascospores as well as the type of conidia. Most of the species have aScopulariopsis-type of conidial stage.M. variabilisMassee and Salmon is placed in synonomy underM. longirostrisZukal.Microascus stysanophorus(Matt.) comb. nov. is proposed.

ISSN:0008-4026    

DOI:10.1139/b61-143

出版商:NRC Research Press    

年代:1961

数据来源: NRC

摘要:

The Plectascales and Perisporiales are both artificial taxa each consisting of a miscellaneous assemblage of unrelated genera. The generic namePerisporiumis not valid for species of Ascomycota (Ascomycetes). The valid name for those species which produce ascocarps isPreussiaFuckel. The ascocarps are non-ostiolate (cleistothecia) and their development is the same as that in the Loculo-ascomycetes (producing a pseudothecium). The ascocarp ofPreussiais thus a cleistothecial pseudothecium. The genus most closely related toPreussiaisSporormiaand the two may be included in the same family Sporormiaceae.Preussiais not included in the Phaeotrichaceae on account of the elongated germinal slit and lack of hairs on the peridium of the ascocarp. Twelve species are included with descriptions and illustrations. The type species ofPreussiaisP. funiculataFuckel. Three species are transferred to this genus fromPerisporium. These areP. punctata(Auersw.) Sacc.,P. typharumSacc, andP. vulgareCorda. One species is transferred from each of the following genera:Sporormia(Sp. fleischhakiiAuersw.),Muellerella(M. nigraRoutien),Pycnidiophora(P. dispersaClum),Anixiopsis(A. multisporaSaito and Minoura), andThielavia(T. indicaChattop. and Das Gupta). The following three species are described as new:P. isomera, P. terricola, andP. purpurea.

ISSN:0008-4026    

DOI:10.1139/b61-144

出版商:NRC Research Press    

年代:1961

数据来源: NRC

摘要:

The genusAnixiellaSaito and Minoura is validated with a Latin description.Thielavia reticulataBooth and Ebben is transferred toAnixiellaand the species redescribed and illustrated. The globose, blackish perithecia are nonostiolate. The broadly clavate asci are arranged in a fascicle, have a thickened ring in the apex, but are evanescent. These characteristics, along with the dark, pitted ascospores, indicate that this species has evolved from the genusGelasinospora, which differs in having ostiolate perithecia. The new genusDiplogelasinosporawith a single new speciesD. princepsrepresents another line evolved fromGelasinospora. As inAnixiella, the dark perithecia are nonostiolate and the cylindrical asci are evanescent. However, the ascospores have a hyaline cell formed at the base by means of a transverse septum.

ISSN:0008-4026    

DOI:10.1139/b61-145

出版商:NRC Research Press    

年代:1961

数据来源: NRC