摘要:

Conidia ofMeristacrum asterospermumwere found to be forcibly ejected, supporting the position of this fungus in the Entomophthoraceae. Conidia adhering to the integument of a live nematode either penetrate directly by a germ tube or germinate externally and produce secondary conidia. Resting spores germinate and produce a single erect conidiophore similar to those produced by thallodic segments.

ISSN:0008-4026    

DOI:10.1139/b73-031

出版商:NRC Research Press    

年代:1973

数据来源: NRC

摘要:

The ovule ofStipa elmeriis bitegmetic, hemianatropous, and pseudocrassinucellate. The micropyle is formed by the inner integument. The inner integument is two cells thick except at the micropyle. Its inner layer is persistent and safraninophilic, and some of its cells develop secondary walls. A cuticle is also present outside the inner integument. The outer integument is two cells thick except for a bump four or five cells thick at the chalazal end. At later stages of development, the outer integument breaks down except at the chalazal end. As the ovule develops, it undergoes changes in orientation as a result of growth pattern changes in the nucellus. A multiple protoderm is present in some parts of the nucellus.The outer layer of the nucellus persists to later stages of development and is covered by a cuticle. Fruit wall changes during development are (1) formation of a thick, unlignified wall on the protoderm, (2) elongation of cells lining the locule, and (3) decrease in number of cells. Megagametophyte development is normal and the antipodals proliferate. Before fertilization, both synergids undergo cytological change and one decreases in size. The pollen tube appears to enter at the base of the larger synergid. The endosperm is free nuclear at first but then becomes cellular. At later stages of development, the outer layer of the endosperm is meristematic. On the basis of embryological data, the following phenetic series can be constructed:S. elmeri→S. lemmonii–S. hendersonii→S. tortilis→Oryzopsis miliacea. Available embryological data does not indicate a close relationship between the Gramineae and the Juncaceae or Cyperaceae.

ISSN:0008-4026    

DOI:10.1139/b73-032

出版商:NRC Research Press    

年代:1973

数据来源: NRC

摘要:

The type specimens of 24 epithets ofConiophorawere studied and most are redescribed. Eleven names are excluded fromConiophora. Seven are Hymenomycetes of uncertain generic position:C. albo-olivaceaRick,C. harperiBurt,C. indicaMassee,C. janthinospora(Pat.) Sacc. & Trav.,C. lichenoidesMassee,C. stratalisMassee, andC. viridis(Berk.) Cooke ex Sacc. In addition,C. broomeianaMassee is not a basidiomycete;C. lateritiaSpeg. is a nomen dubium;C. murinaisSeptobasidium murina(Berk. & Br.) Petch; andC. stereoideaRick is aGloeocystidiellum. Thirteen epithets are placed in synonymy with otherConiophoranames:Coniophora berkeleyiMassee,C. betulaeP. Karst.,C. macra(P. Karst.) P. Karst.,C. aridasubsp.macraP. Karst., andC. subdealbata(Berk. & Br.) Massee all asC. suffocata(Peck) Massee;C. cookeiMassee and C.subcinnamomeaP. Karst. both asC. arida(Fr.) P. Karst.;C. kalmiae(Peck) Burt,C. luteocincta(Berk.) Cooke ex Sacc,C. luridaP. Karst., and C.aridavar.lurida(P. Karst.) P. Karst. all asC. puteana(Fr.) P. Karst.;C. inflataBurt asC. submembranacea(Berk. & Br.) Cooke ex Sacc.; andC. betulaevar.eucalyptiBres. & Torrend asC. hanoiensisPat.

ISSN:0008-4026    

DOI:10.1139/b73-033

出版商:NRC Research Press    

年代:1973

数据来源: NRC

摘要:

Forty-eight species and two varieties of the generaCetraria, Hypogymnia, Parmelia, Parmeliopsis, andPlatismatiain the lichen family Parmeliaceae are reported from a 13 400-km2area in the mountains and foothills of southwestern Alberta. Twelve of these taxa are new to Alberta. The distribution and habitats occupied by each of the taxa are described. Thirty-four (67%) of the taxa are of Circumpolar distribution and 17 (33%) are endemic to North America. The three best represented distribution elements are Circumpolar, Arctic – Boreal Alpine – Montane (13 taxa, 26%); Circumpolar, Boreal Montane (9 taxa, 18%); and American, Cordilleran (12 taxa, 24%). One new combination,Hypogymnia enteromorphavar.inactiva, is proposed.

ISSN:0008-4026    

DOI:10.1139/b73-034

出版商:NRC Research Press    

年代:1973

数据来源: NRC

摘要:

Nonuniform distribution of total alkaloids in leaf lamina ofNicotiana tabacumrequires precise positioning of the fixed diameter cutter in obtaining leaf disks which provide a reliable estimate of total alkaloids content of the leaf. This is time-consuming. Other methods such as the whole leaf technique yield excessive amounts of tissue to process. Our procedure uses a band technique that overcomes the problems associated with the unequal distribution of total alkaloids in the lamina and increases sampling rate threefold. This procedure is superior to others for sampling the different sizes of leaves on the plant at anyone time until maturity.

ISSN:0008-4026    

DOI:10.1139/b73-035

出版商:NRC Research Press    

年代:1973

数据来源: NRC