A text-book of mycology and plant pathology . thallic (dioecious) forms. The homothallicmoulds are those in which the sexual gametes, which conjugate, arisefrom the same mycelium, while the heterothallic forms are those inwhich two distinct mycelia contribute the gametes which ultimatelyunite sexually. The homothallic (hermaphroditic) moulds he dividesinto the heterogamic hermaphrodites in which there is an inequality inthe size of the gametes (the large one being female and the small onemale), and the homogamic hermaphrodites in which the gametes are ofequal size. The heterogamic hermaphrodit
A text-book of mycology and plant pathology . thallic (dioecious) forms. The homothallicmoulds are those in which the sexual gametes, which conjugate, arisefrom the same mycelium, while the heterothallic forms are those inwhich two distinct mycelia contribute the gametes which ultimatelyunite sexually. The homothallic (hermaphroditic) moulds he dividesinto the heterogamic hermaphrodites in which there is an inequality inthe size of the gametes (the large one being female and the small onemale), and the homogamic hermaphrodites in which the gametes are ofequal size. The heterogamic hermaphrodites include the followingfungi: Syncephalis, Dicranophora fulva, Absldia spinosa, Zygorhynckusheterogamus, Z. Mcelleri, Z. Viiillemini. The homogamic hermaph-rodites comprise: Mortierella polycephala, Mucor genevensis, Spinellnsfusiger and Sporodinia grandis (Fig. 28). The dioecious, or hetero- 94 MYCOLOGY thallic species are all homogamic, that is, there is no difference in thesize of the two gametes which conjugate. This group includes such. Fig. 28.—Zygospore formation in Sporodinia grandis from material growing on toad-stool. {Slide prepared by H. H. York, Cold Spring Harbor, July 29, IQISO
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Keywords: ., bookcentury1900, bookdecade1910, bookidtextbook, booksubjectfungi
