. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. Ill] PLECTASCALES 69 liberated by its decay. The asci are spherical or pyriform and contain two to eight continuous spores, the walls of which may be variously ornamented. In both Penicilliuni and Eurotium the perithecium may develop an excep- tionally thick wall, and pass into a resting stage sometimes several weeks in duration. Such a structure is described as a sclerotium. In Eurotium Jurbarioriun^ the development of perithecia is readily induced by cultivation on prune agar'-' made up with forty per cent, of cane- sugar. Ripe perithec
![. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. Ill] PLECTASCALES 69 liberated by its decay. The asci are spherical or pyriform and contain two to eight continuous spores, the walls of which may be variously ornamented. In both Penicilliuni and Eurotium the perithecium may develop an excep- tionally thick wall, and pass into a resting stage sometimes several weeks in duration. Such a structure is described as a sclerotium. In Eurotium Jurbarioriun^ the development of perithecia is readily induced by cultivation on prune agar'-' made up with forty per cent, of cane- sugar. Ripe perithec Stock Photo](https://c8.alamy.com/comp/RDX1J2/fungi-ascomycetes-ustilaginales-uredinales-fungi-ill-plectascales-69-liberated-by-its-decay-the-asci-are-spherical-or-pyriform-and-contain-two-to-eight-continuous-spores-the-walls-of-which-may-be-variously-ornamented-in-both-penicilliuni-and-eurotium-the-perithecium-may-develop-an-excep-tionally-thick-wall-and-pass-into-a-resting-stage-sometimes-several-weeks-in-duration-such-a-structure-is-described-as-a-sclerotium-in-eurotium-jurbarioriun-the-development-of-perithecia-is-readily-induced-by-cultivation-on-prune-agar-made-up-with-forty-per-cent-of-cane-sugar-ripe-perithec-RDX1J2.jpg)
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. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. Ill] PLECTASCALES 69 liberated by its decay. The asci are spherical or pyriform and contain two to eight continuous spores, the walls of which may be variously ornamented. In both Penicilliuni and Eurotium the perithecium may develop an excep- tionally thick wall, and pass into a resting stage sometimes several weeks in duration. Such a structure is described as a sclerotium. In Eurotium Jurbarioriun^ the development of perithecia is readily induced by cultivation on prune agar'-' made up with forty per cent, of cane- sugar. Ripe perithecia appear after ten days or a fortnight at 15" C. A similar method should probably prove successful with other species. The only known species oi Aphanoasctis, A. cinnabarinus, was found by Zukal on the dung of alligators. The character of its perithecium wall (fig. 28) suggests a transition stage between the Gymnoascaceae, in which it is. Fig. 28. Aphanoascus cinnabarimts XV2Li a. elongated, septate archicarp and swollen antheridiiim ; b. ascogenous hyphae and sheath; after Dangeard. placed by Dangeard, and the Aspergillaceae. Multinucleate conidia are borne laterally or terminally on the mycelium. The sexual organs arise from the same or different hyphae; the antheridium (Dangeard's trophogone) becomes swollen, and the elongated archicarp, which appears at first to be without septa, coils round it; their fusion has not been observed. Each at first contains from three tp ten nuclei; later the number rises to about twenty in the antheridium and as many as forty in the archicarp. According to Dangeard the contents of the antheridium degenerate, though the cell itself persists for a considerable time. The archicarp undergoes septation, branches, and gives rise to asci. In the meantime vegetative hyphae grow up and invest the essential organs, forming a loose tangle around them The inner part of the investment remains in this state and is eventually absorbed, but 1 Eurotiut