Fungi, Ascomycetes, Ustilaginales, Uredinales . Fig. 56. Ascodesmis nigricans Van Tiegh.; sexualapparatus; a. trichogyne; b. antheridium; c.oogonium; (/. stalk; e. gametophytic hypha;after Claussen. Fig. 57. Pyronema confluens; spherical oogo-nium giving rise to ascogenous hyphae; a. an-theridium ; /. trichogyne; c. oogonium ; d. as-cogenous hyphae; x 1040; after Clau6sen. the oogonium becomes septate, so that the fertile part is multicellular andthe ascogenous hyphae arise from several cells. This type closely approxi-mates to that in Eurotium and some other Plectascales, and there seemsreaso

Fungi, Ascomycetes, Ustilaginales, Uredinales . Fig. 56. Ascodesmis nigricans Van Tiegh.; sexualapparatus; a. trichogyne; b. antheridium; c.oogonium; (/. stalk; e. gametophytic hypha;after Claussen. Fig. 57. Pyronema confluens; spherical oogo-nium giving rise to ascogenous hyphae; a. an-theridium ; /. trichogyne; c. oogonium ; d. as-cogenous hyphae; x 1040; after Clau6sen. the oogonium becomes septate, so that the fertile part is multicellular andthe ascogenous hyphae arise from several cells. This type closely approxi-mates to that in Eurotium and some other Plectascales, and there seemsreaso Stock Photo

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Fungi, Ascomycetes, Ustilaginales, Uredinales . Fig. 56. Ascodesmis nigricans Van Tiegh.; sexualapparatus; a. trichogyne; b. antheridium; c.oogonium; (/. stalk; e. gametophytic hypha;after Claussen. Fig. 57. Pyronema confluens; spherical oogo-nium giving rise to ascogenous hyphae; a. an-theridium ; /. trichogyne; c. oogonium ; d. as-cogenous hyphae; x 1040; after Clau6sen. the oogonium becomes septate, so that the fertile part is multicellular andthe ascogenous hyphae arise from several cells. This type closely approxi-mates to that in Eurotium and some other Plectascales, and there seemsreason to regard it as a primitive female organ among Discomycetes. From it may be derived the spherical oogonium of Pyronema (fig. 57)which differs mainly in the fact, no doubt connected with its shape, that itdoes not become septate after fertilization, so that the ascogenous hyphaearise from one cell only. The same is true of Lachnea stercoral, which

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