A text-book of mycology and plant pathology . rgeff^ has studied the variability, sex-uality and heredity of Phycomyces nitens and has brought his culturalinvestigations into line with the recent developments of cytology andgenetics. His paper should be read by all students, who may beinterested in the extension of the methods of genetics into aninvestigation of the lower plants. The genus Ahsidia includes five species. In these fungi the suspen-sors are borne at the base of the two gamete cells which fuse to form thezygospore, which when mature is covered by a basket-like covering of 1 BuRGEF
A text-book of mycology and plant pathology . rgeff^ has studied the variability, sex-uality and heredity of Phycomyces nitens and has brought his culturalinvestigations into line with the recent developments of cytology andgenetics. His paper should be read by all students, who may beinterested in the extension of the methods of genetics into aninvestigation of the lower plants. The genus Ahsidia includes five species. In these fungi the suspen-sors are borne at the base of the two gamete cells which fuse to form thezygospore, which when mature is covered by a basket-like covering of 1 BuRGEFF, H.: Untersuchungen iiber Variabilitat, Sexualitat und Erblichkeith?A Phycomyces nitens Kuntze. Flora, Band 108: 353-448; review by G. V. Ubisch(Dahlem) in Botanischcs Centralhlatt, Band 128, Nr. 23: 630-632, 1915. MOULD FUNGI lOI Straight appressoria, which hook together by their curved extremities,thus giving additional protection to the zygospore. Sporodinia grandis,the single species of another genus, lives on large fleshy fungi of the. Fig. -Sporangia of i, Thamnidium elegans; 2, 3, 4, Thamnidiutn chcetocladioides;5, Chalocladium Jonesii. {After Brefeld.) families (Fig. 28) AcARiCACEiE, Boletace^, and Hy-DNACE^. Its sporangiophores i to 3 cm. high are finally brown in colorand dichotomously branched. The sporangia are spheric with a deli- I02 MYCOLOGY cate sporangial wall, wliich soon disappears leaving the spores on ahemispheric columella. These spores are ii to yoju broad. The ^oofj,broad zygospores are produced from similar branches of a dichotomouslybranched zygosphore. The mycelium of the species of Thamnidiumenters the nutritive substratum. The large sporangia are terminalwhile the smaller secondary sporangia are borne on lateral branches inwhorls below the terminal sporangium. This is typically seen in Th.
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