摘要:

Study of type material ofUrohendersonia platensis, U. indica, andU. stipaereveals that structures described by their original authors as ‘basidia’ or ‘pedicels’ (in contemporary parlance, conidiophores) are, in fact, apical conidium appendages. The true conidiophores and the processes of conidiogenesis are described and illustrated.Urohendersoniahas unilocular, ostiolate pycnidia producing three-septate, colored conidia that are enclosed from an early stage of development in a sheath which extends apically as a hyaline, filiform process.UrohendersoniaandHendersoniaare delineated. Revised descriptions are given forUrohendersoniaand its four species. A fifth species,U. mysorensis, is described as new. A key to the five species is given.

ISSN:0008-4026    

DOI:10.1139/b71-262

出版商:NRC Research Press    

年代:1971

数据来源: NRC

摘要:

Development, position, septation, color and size of chlamydospores, and temperature response ofV. nigrescensandV. nubilumis described. The affinities of the two species to other fungi are discussed.

ISSN:0008-4026    

DOI:10.1139/b71-263

出版商:NRC Research Press    

年代:1971

数据来源: NRC

摘要:

This is a report of investigations of the petrified woods from the Cypress Hills Formation (Oligocene) of Saskatchewan. Families represented are Pinaceae (Pinoxylon hanlineisp. nov.), Taxodiaceae (Sequoioxylon gypsaceum(Gothan) Greguss), Magnoliaceae (Magnolioxylon michelioidesHofmann), Simaroubaceae (Ailanthoxylon canalosumsp. nov.), Hamamelidaceae (Liquidambaroxylon speciosumFelix), and Juglandaceae (Eucaryoxylon canadensissp. nov.). It is interesting to note here that except for the Pinaceae none of these families is now a part of the flora of this region. Presently genera of the other families occur in the eastern and southwestern United States, in the southeastern part of Canada (Carya), or in eastern Asia.

ISSN:0008-4026    

DOI:10.1139/b71-264

出版商:NRC Research Press    

年代:1971

数据来源: NRC

摘要:

A monographic investigation of the genusHolwayaSacc. leads to acceptance of a single species,H. mucida(Schulzer) comb, nov., for which a longer-spored variant from Japan,H. mucidasubsp.nipponicasubsp. nov., is described. The prominent stilbaceous imperfect state present in both subspecies isCrinula caliciiformis(Fr.) ex Fr.CrinulaSacc. non Fries,DitiolaSchulzer non Fries, andJugglerandiaLloyd are synonyms ofHolwaya. Two species previously referred to the genus are excluded:H. salicisbecomesDurandiella salicis(Müller & Ahmad) comb, nov.;H. pusillabelongs to the genus usually calledCorynellaBoud., but that generic name is an invalid later homonym.ClaussenomycesKirschst. is available to accommodate species previously placed inCorynella, and three new combinations are proposed,Claussenomyces atrovirens(Pers. ex pers.),C. prasinulus(Karst), andC. pusillus(Rehm); a key to the four accepted species of that genus is provided.

ISSN:0008-4026    

DOI:10.1139/b71-265

出版商:NRC Research Press    

年代:1971

数据来源: NRC

摘要:

Plant microfossils have been recovered from Oligocene sediments which outcrop along the Fraser River in the central interior of British Columbia, Canada. The sediments are composed of interbedded clays, sands, gravels, and lignites which were deposited as a part of an ancestral Fraser River system.The most commonly encountered members of the assemblage areQuercus, Alnus Carya, Liquidambar, Ulmus/Zelkova, Juglans, Pterocarya, Osmunda, and members of the Taxodiaceae, with infrequent occurrences ofEngelhardtia, Prosopis, ?Psilotum, Ephedra, and ?Dorstenia. This assemblage suggests a warm temperate to near subtropical climate. A warm polar sea, a lowered Coast Range to the west, and a greater elevation of the Rockies to the east are suggested as a possible explanation for the climate.One new genus and 11 new species have been erected. Several species, includingProsopis quesneli, Diervilla echinata, Triporate B, andTaxodium rouseiappear to be restricted to these beds, and may well be good index fossils for the Oligocene of western Canada.

ISSN:0008-4026    

DOI:10.1139/b71-266

出版商:NRC Research Press    

年代:1971

数据来源: NRC

摘要:

An illustrated account of conidium ontogeny is given forMacrophomaspp.,Sarcophoma mirbellii(Fr.) Höhnel,Sirococcus gibberoideus(Cooke and Massee) Grove,Monostichellaspp.,Cryptocline betularum(Ell. and Mart.) Arx, andLeptomelanconium tremuloides(Ell. and Everh.) Arx.

ISSN:0008-4026    

DOI:10.1139/b71-267

出版商:NRC Research Press    

年代:1971

数据来源: NRC

摘要:

An illustrated account of conidium ontogeny is given forColletotrichumspp.,Cylindrogloeum trillii(Ell. and Everh.) Arx,Discogloeum veronicae(Libert) Petrak,Gloeosporidiellaspp.,Rhynchosporina meinersii(Sprague) Arx,Monostichellaspp.,Cryptoclinespp.,Cryptosporiumspp., andMelanophoraspp.

ISSN:0008-4026    

DOI:10.1139/b71-268

出版商:NRC Research Press    

年代:1971

数据来源: NRC

摘要:

Conidium ontogeny is described and illustrated forVouauxiella lichenicola(Lindsay) Petrak and Sydow.

ISSN:0008-4026    

DOI:10.1139/b71-269

出版商:NRC Research Press    

年代:1971

数据来源: NRC

摘要:

Data from culture experiments presented strongly suggest that the development of leaf primordia at the shoot apex may be divided into three phases inOsmunda cinnamomea. Phase I lasts from inception (Im) to some point in time during P1. Phase II probably begins somewhere between Imand I1, and may be retained as long as P9. Phase III is evident as early as P1and continues through the entire primordial sequence to include Pn. In nature, or under experimental conditions where physiological continuity between the primordium and shoot apical meristem complex is maintained,O. cinnamomeaprimordial expression is phase III expression (leaf only). However, if the primordia produced at the shoot apex are removed from certain external biological influences (specifically the shoot apical meristem and certain older primordia) terminal expression of the primordia may be either phase I, phase II, or phase III depending upon the developmental phase of the primordia at the time of their isolation.

ISSN:0008-4026    

DOI:10.1139/b71-270

出版商:NRC Research Press    

年代:1971

数据来源: NRC

摘要:

The susceptible tomato cultivar Craigella and three TMV-tolerant cultivars heterozygous for the genesTm-1,Tm-2, andTm-22respectively, were united by grafting into a bundle of four plants such that the Craigella was in contact with theTm-1 component,Tm-1 withTm-2, andTm-2 withTm-22. The susceptible component of the graft combination was then inoculated with either strain 0 or strain 1 of tobacco mosaic virus. Subsequently, the effect of host passage was determined by assaying leaf samples from all four components of the graft and then identifying the virus as to pathogenic strain by inoculation to differential hosts. Graft combinations which had received strain 0 inoculum yielded variants which were either strain 1 or 2 or 1.2; grafts originally infected with strain 1 yielded variants which were strain 2 or 1.2. Since no new strains were detected in the susceptible Craigella component it is concluded that the changes in pathogenicity of TMV were mediated by graft passage into tolerant hosts.

ISSN:0008-4026    

DOI:10.1139/b71-271

出版商:NRC Research Press    

年代:1971

数据来源: NRC