Fungi, Ascomycetes, Ustilaginales, Uredinales . a clavata Sacc,nat. size; c. Leolia lubrica Pers., form s/ipila/a,x^\ after Massee. The ascophore is erect and stipitate with the fertile portion terminal,and either club-shaped (fig. 91 n, b), laterally compressed, or forming a cupor a pileus (fig. 91 c). In some of the simpler forms, as in Geoglossumliirsnt/tm, there is no clear lineof demarcation between the fertileand sterile regions. The ascus con-tains eight spores and opens by theejection of a plug. The young ascocarp consists of adense tangle of vegetative filaments;in the earl) stages a
Fungi, Ascomycetes, Ustilaginales, Uredinales . a clavata Sacc,nat. size; c. Leolia lubrica Pers., form s/ipila/a,x^\ after Massee. The ascophore is erect and stipitate with the fertile portion terminal,and either club-shaped (fig. 91 n, b), laterally compressed, or forming a cupor a pileus (fig. 91 c). In some of the simpler forms, as in Geoglossumliirsnt/tm, there is no clear lineof demarcation between the fertileand sterile regions. The ascus con-tains eight spores and opens by theejection of a plug. The young ascocarp consists of adense tangle of vegetative filaments;in the earl) stages a more or lessconspicuous veil has been identifiedin several genera (though not as yetin Gcogloss/tm). It is composed, asin the I lelvellaceae, of from and continuouswith the outer layer of the are indications that it opensat first by a pore at the apex, but itsoon breaks up into scales and dis- Fig. <)i. a. Geoglossum hirsulum Pers., x 230; /•?appears. , X400; after 132 DISCOMYCETES [ch. In Lcotia lubrica a large branching cell, presumably an oogonium,occurs at the base of the very young ascocarp and appears to give rise tothe ascogenous hyphae. As far as the characters of the mature fruit are concerned, two lines ofdevelopment can be traced, both starting from Geoglossum and passing, theone through Spathularia to Vibrissea, the other through Mitrula and Leotiato the Helvellaceae. In the species of Spathularia and Vibrissea, as in Geoglossum, the sporesare very long, narrow and septate, lying side by side in the ascus. Geo-glossum is distinguished by its coloured spores (fig. 92a), the other two genera,in both of which the spores are hyaline (fig. 92 b), by the form of thefructification. In the rest of the Geoglossaceae, as in the Helvellaceae, the spores areelliptical and hyaline, and are arranged one above the other in the } may be continuous or septate. In Mitrula the fertile region isirre
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfungi, bookyear1922
