ISSN:0027-5514    

DOI:10.1080/00275514.1968.12018542

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor

摘要:

SUMMARYLiving material ofExidia nucleatawas stained with the HCl-Giemsa technique for observations of nuclear behavior in the basidium. The study represents the first cytological examination of a member of the Tremellaceae with the technique. Previous reports indicated that the haploid number of chromosomes forExidia nucleatawas four; the results achieved in this study revealed that the haploid number is between 10 and 12.

ISSN:0027-5514    

DOI:10.1080/00275514.1968.12018543

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor

摘要:

SUMMARYPerithecia ofNeurospora terricolaandN. dodgeiare initiated by the formation of a coiled archicarp, the terminal portion of which is soon differentiated as an ascogonium consisting of several cells. Sterile hyphae which early envelop the female organ give rise to the ascocarp wall. No trichogynes were identified.When the protoperithecium ofN. terricolahas reached a diameter of approximately 100μand that ofN. dodgeiabout 160μ, primary ascogenous hyphae start to develop from the ascogonium. Immediately above these a centrum cavity appears into which paraphyses quickly grow. Asci do not appear until the centrum has attained nearly its maximum size and an ostiolar canal has been formed. As the asci develop, the paraphyses disintegrate. It is concluded that the perithecial centrum is of the“Xylariatype,”as defined by Luttrell, and thatNeurosporashould therefore be placed in the Xylariales in the Luttrell scheme of classification.In many morphological and cytological features,N. terricolaandN. dodgeiresemble closely not only other species ofNeurosporapreviously studied but also other members of the Sordariaceae (sensuMoreau), particularly members of the generaGelasinospora, Sordaria, andPleurage.Noteworthy cytological features encountered were: multinucleate ascogonial cells; ascospores initially uninucleate but becoming binucleate prior to maturation; inN. terricolabeaked nuclei bearing prominent appendages at the 4-nucleate stage of ascus development; and a haploid chromosome number of 7 inN. terricola.

ISSN:0027-5514    

DOI:10.1080/00275514.1968.12018544

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor

摘要:

SUMMARYVeluticeps berkeleyiis a widely distributed wood-rotting fungus in North America. It is apparently present through much of the natural range ofPinus ponderosain the western United States, and occurs on other pines in Central America and in Cuba. It causes a brown cubical heartrot in living trees and a saprot in down timber. Descriptions of the basidiocarps, cultural characters, and the associated rot are given.Veluticeps fuscais placed in synonymy withV. berkeleyi.

ISSN:0027-5514    

DOI:10.1080/00275514.1968.12018545

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor

摘要:

SUMMARYThis paper presents expanded and modified descriptions ofRavenelia atrocrustaceaP. Henn.,R. sydowianaRick,R. lonchocarpiicolaSpeg.,R. lonchocarpiLagh.&Diet, andR. bakerianaDiet. A new variety ofR. lonchocarpiicolais described andR. meraCumm. is reduced to varietal status.Ravenelia tauaensisViégas is reduced to synonymy withR. atrocrustacea.

ISSN:0027-5514    

DOI:10.1080/00275514.1968.12018546

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor

摘要:

SUMMARYA new species ofDictyostelium, isolated from leaf mold collected in Poza Rica, Mexico, is described. The slime mold is characterized by the relatively small dimensions of its spores and myxamoebae, and more especially by its diminutive sorocarps—hence the nameD. deminutivum.The slime mold may be cultivated satisfactorily in association with eitherEscherichia coliorPseudomonas fluorescensupon agar media of very low nutrient content. Optimal growth and development occur in association with the latter bacterium upon 0.025% glucose-0.025% peptone agar when glass Petri plate lids are replaced with porous clay covers at the time cell aggregation begins.Aggregations that subsequently produce normal sorocarps typically appear mound-like and arise by the concerted influx of unaligned myxamoebae, either singly or in small groups, rather than by the formation and convergence of definite streams. Depending upon their size, such pseudoplasmodia may occasionally yield single fructifications, but as a rule they produce several sorocarps which arise near the periphery of the cell mass.In the completed sorocarp, the sorophore tapers gradually from base to apex and consists uniformly of a single tier of cells, the outlines of which may be difficult to discern, particularly in the terminal area.

ISSN:0027-5514    

DOI:10.1080/00275514.1968.12018547

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor

摘要:

SUMMARYStigmatomyces ceratophorusonFannia canicularisappears to be a most likely combination for experimental studies in the Laboulbeniales. The host is relatively easy to maintain in the laboratory and the fungus is large and easily manipulated. Infection may occur on almost any external portion of the host, but, in primary infections, is usually found in a ventral position on the males and dorsally on the females. This primary positioning is related to transmission at mating. Secondary spread from the back to the legs is especially common in females. These observations may help reconcile the published differences between Thaxter (1896) and Peyritsch (1875) on position specificity inStigmatomyces.Quantitative evidence suggests that the fungi do not shorten the life span of the host. Holes penetrating the host are obvious and it is clear that the thallus obtains nutrients from the underlying tissues of the fly. Spores placed on fly-wings on nutrient medium responded to changes in that medium. The fly-wings could not be replaced by chitin or cellulose membranes. Relatively large, spermatia-producing plants may be grown to the 20-cell stage in pure culture.

ISSN:0027-5514    

DOI:10.1080/00275514.1968.12018548

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor

摘要:

SUMMARYAjellomyces dermatitidis, the perfect form ofBlastomyces dermatitidis, was found to have characteristics typical of the Gymnoascaceae.Ajellomycesis distinguished from the other genera in this family by the development of thick-walled, closely coiled spiraled hyphae that radiate from a common center in the cleistothecium. The spirals give rise to lateral hyphae that either branch repeatedly to form characteristic, irregularly shaped cells or that give rise to clusters of asci. This fungus was shown to be heterothallic.Successful mating of strains isolated from people with those obtained from dogs indicates that the isolates belong to the same species. Further evidence that there is only one species of the pathogen was given through successful pairing of strains isolated from patients living in widely scattered geographical locations.Preliminary experiments with 12 monoascospore cultures showed that they varied widely in pathogenicity.

ISSN:0027-5514    

DOI:10.1080/00275514.1968.12018549

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor

摘要:

SUMMARYGnomonia platani, the fungus that causes sycamore anthracnose, produces asexual spores in thin-walled pycnidia in young twigs. A pressure cushion is formed prior to formation of the pycnidium. It originates at the phellogen. Pressure cushion enlargement occurs through growth and swelling of hyphal cells. The pressure cushion ruptures the phellem. The pycnidium forms in the cortical cells beneath the pressure cushion or at the base or margin of the pressure cushion. Conidia produced in the pycnidium are released through the ruptured phellem.

ISSN:0027-5514    

DOI:10.1080/00275514.1968.12018550

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor

摘要:

SUMMARY“Phenotypic”identicalness for certain compatibility loci appears to determine whether or not 2Didymium iridisplasmodia will fuse when brought into contact. Based on almost 5,000 fusion tests, it has been firmly established that if Plasmodium X fuses with Y and Y fuses with Z, then X will also fuse with Z.Mass-spore F1plasmodia almost always display the same compatibility phenotype as their parent Plasmodium. Mass-spore-derived plasmodia are probably always heterokaryotic, containing a large number of different nuclear types.Two types of heterokaryons, other than those involving plasmodial compatibility alleles, were created. One type consisted of 2 different sets of plasmodial color factors while the other brought together 2 sets of mating type alleles.Three different homothallic isolates ofD. iridiswere studied, and all intra-isolate plasmodial combinations were compatible, but all inter-isolate ones were incompatible. It is concluded that the homothallic, as well as the heterothallic isolates, display a plasmodial compatibility system.

ISSN:0027-5514    

DOI:10.1080/00275514.1968.12018551

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor