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Identifier: phylogenyrelatio00atki (find matches)
Title: Phylogeny and relationships in the Ascomycetes
Year: 1915 (1910s)
Authors: Atkinson, George Francis, 1854-1918
Subjects: Ascomycetes Plants
Publisher: (n.p.
Contributing Library: The LuEsther T Mertz Library, the New York Botanical Garden
Digitizing Sponsor: The LuEsther T Mertz Library, the New York Botanical Garden

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re or less remote an-cestry. At some time prior to ascus formation these twonuclei may possibly become associated in pairs into a syn-karion and multiply in the ascogenous threads by conjugatedivision, or the synkarion and conjugate division may be post-poned to the ascus hook and the complicated series of fusionsbetween the ultimate and antepenult cells of the crozier, orproliferations of the young ascus with accompanying con-jugate divisions of the synkarion. Dangeard (94) first described the presence of two nuclei inthe young ascus, and their fusion, in several species (Borreraciliaris, Peziza vesiculosa, Helvetia ephippium, Geoglossum (Vol. 2 336 ANNALS OF THE MISSOURI BOTANICAL GARDEN hirsutum, Acetahula calyx, Exoascus deformans, and somelichens). The origin of the ascus was correctly described ina number of cases, but in the majority of cases at that time hethought the young ascus arose by the copulation of two unicel-lular gametes according to a method similar to the formation
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Fig. 8. Pyronema confluens: A, section of mature discocarp; B, groupof archicarps copulating with antheridia by means of the slender prolonga-tion (trichogyne) of the ascogonium which is separated as a distinct cell;C, pair of sexual organs copulating by means of the trichogyne cell, asco-gonium at left, antheridium at right; D, showing multinucleate condition ofsexual organs and communication of antheridium and trichogyne. a,antheridium; b, trichogyne; c, ascogonium. E, older stage of a similargroup of sexual organs after the antheridial nuclei have entered the asco-gonium and the trichogyne nuclei have degenerated; also showing early stageof growth of ascogenous hyphae from the ascogonium; F, showing relationof ascogonia, ascogenous hyphae, asci, and paraphyses in mature fruitbody.—After Harper. 1915) ATKINSON PHYLOGENY IN THE ASCOMYCETES 337 of the ascus in Eremascus, so that the ascus appeared to besupported on two stalks. Frequently, however, in Pezizavesiculosa and Helvella ep

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  • bookid:phylogenyrelatio00atki
  • bookyear:1915
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Atkinson__George_Francis__1854_1918
  • booksubject:Ascomycetes
  • booksubject:Plants
  • bookpublisher:_n_p_
  • bookcontributor:The_LuEsther_T_Mertz_Library__the_New_York_Botanical_Garden
  • booksponsor:The_LuEsther_T_Mertz_Library__the_New_York_Botanical_Garden
  • bookleafnumber:27
  • bookcollection:biodiversity
  • BHL Collection
  • BHL Consortium
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28 July 2014

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