Fungi, Ascomycetes, Ustilaginales, Uredinales . ins eight spores.The species of Gymnoascus occurin various habitats, on dung, beesnests, dead grass, etc. In G. Reesii, according to Dale,two branches grow up from thesame hypha, one on each side ofa septum, and become twistedaround one another. These are theantheridium and oogonium; theirfree ends swell into club-shapedheads which lie in close contact andeach becomes delimited by a transverse septum. The walls between thembreak down, and the contents of the antheridium pass over into theoogonium (fig. 27 a, b). Both cells are at first uninucleat
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Fungi, Ascomycetes, Ustilaginales, Uredinales . ins eight spores.The species of Gymnoascus occurin various habitats, on dung, beesnests, dead grass, etc. In G. Reesii, according to Dale, two branches grow up from thesame hypha, one on each side ofa septum, and become twistedaround one another. These are theantheridium and oogonium; theirfree ends swell into club-shapedheads which lie in close contact andeach becomes delimited by a transverse septum. The walls between thembreak down, and the contents of the antheridium pass over into theoogonium (fig. 27 a, b). Both cells are at first uninucleate, but later coeno-cytic, and, though the history of the nuclei has not been traced, it seemsalmost certain that fusion must sooner or later occur. Up to this point the sexual cells are usually quite similar in form, butnow the antheridium grows larger and more spherical, remaining almoststraight, while the oogonium puts out a prolongation which winds aroundit, undergoes septation and soon branches to give rise to ascogenoushyphae (fig. 27 c).. Fi 26. Gymnoascus sp.; a. ascocarp, x 26;b. ascus and free ascospores, x 1040. tn] PLECTASCALES 67 In G. candidus (fig.27 d) the antheridium and oogonium already differin form at the time of their union, and, in the majority of cases, appear to