A text-book of mycology and plant pathology . eloped, at other times it is strongly so. The peridium is poorly formed,or entirely absent. The most interesting genus is Pyronema. has a fruit body i mm. across, and of a yellow or reddishcolor. It is often found in spots where fires have been kindled in thewoods. The structure of the apothecium and the method of its forma-tion following the sexual union of an antheridium and oogonium havebeen described by Harper^ and the essential details have been givenon a former page of this book {ante, pages 123 and 126). ^ Harper, R. A.: Sexual R
A text-book of mycology and plant pathology . eloped, at other times it is strongly so. The peridium is poorly formed,or entirely absent. The most interesting genus is Pyronema. has a fruit body i mm. across, and of a yellow or reddishcolor. It is often found in spots where fires have been kindled in thewoods. The structure of the apothecium and the method of its forma-tion following the sexual union of an antheridium and oogonium havebeen described by Harper^ and the essential details have been givenon a former page of this book {ante, pages 123 and 126). ^ Harper, R. A.: Sexual Reproduction in Pyronema confluens and the Mor-phology of the Ascocarp. Annals of Botany, 14: 231-400, 1900 i66 MYCOLOGY Family 4. Ascobolace^.—-The apothecia of the fungi of thisfamily are unstalked. They are superficial and grow up on peridium is mostly thin, or wanting, and the hypothecium, whichis well developed, consists of rounded parenchyma-like cells. InAscobolus, the ascospores are discharged from the asci by a squirting. Fig. 58.—A, B, Lachnea scutellala. A, Habit; B. ascus with paraphysis; C, D,Lachnea hemisphcerica; C, habit; D, ascus with paraphysis; R, Sarcosphcera arenosahabit; F, G, Sarcosphcera coronaria; F, ascus; G, habit; H, Sarcosphcera arenicolaascus with paraphysis. {See Die natiirlichen Fflanzenfamilien I. i, p. i8i.) action, and this is accomplished probably by the pressure of the cellwall upon the cell sap. The end of the ascus breaks open suddenly, theascus collapses, and the eight spores are discharged simultaneouslyalong with the cell sap. In Ascobolus, which is related to Pyronema,the ascogonium is at first multicellular, but all the cells empty their AND RKLATKD FUNGI 167 contents into a sinj^lc largo one, from which the ascogcnous hyphu;then arise. Family 5. Pezizace^.—The apothecia of this family are saucer-or cup-shaped, sessile or stalked, arising from a mycelium which isfound in the substratum. The peridium and hypoth
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