96 



THE LOWER FUNGI— PHYCOMYCETES 



11. Rhizidium A. Braun (Monatsbcr. Berl. Akad., p. 591, 1856). 

 Several species described from pAirope include, R. mycophilum 



A. Braun (Fig. 25), in slime of Chaetophora, R. lignicola Lindau, 

 saprophytic on wood in water, and R. operculatum (De Wildeman) 

 von Minden, probably saprophytic, on submerged surfaces of 

 aquatic higher plants. 



12. Dangeardia Schroder (Bcr. Deut. Bot. Gesell, 16: 314, pi. 20, 



1898). 

 Erected on a single species, D. mamillata Schroder, found on 

 Pandorma. 



Fig. 27. — Chytridium olla Braun. («) Mature swarmsporangia attached to 

 oospore of Oedogonium. {h) Swarmsporangium enlarged, (c) Resting spore, 

 (d, e) Germinating resting spores, (a, b, after A. Braun 1855; c-e, after de Bary 

 1887.) 



13. Harpochytrium Lagerheim (Hediv., 29: 142, 1890). 



syn. Fulminaria Goh\,{Scripta Hort. Bot. Petrop., 15: 283, 

 1899; 



Rhahdium Dangeard (Ann. Mycol., 1: 61, 1903). 

 A small but interesting genus embracing two or three species 

 parasitic on algae (Fig. 26). These are thoroughly discussed 

 and well illustrated by Atkinson (1903). 



14. Chytridium A. Braun (Erscheinungen der Verjungung. p. 

 198, 1850; Berl. Akad. Abhandl., p. 23, pi. 1, 1855). 

 The oldest genus of the order. As here constituted it contains 

 the type species, C. olla Braun (Fig. 27) and about six others of 

 similar character, all occurring in algae. 



