CHYTRID1ALES 493 



Sporangium broadly pyriform or urceolate; operculum 

 prominent, strongly convex; apophysis spherical, 

 apparently without rhizoids; on Cladophora, Oedo- 



gonium C. inflation, p. 520 



Sporangium citriform, appearing tilted because of sub- 

 apical discharge papilla; on pine pollen 



C. citriforme, p. 521 

 Sporangium spherical, subspherical, ovoid, urceolate, 

 or pyriform; operculum slightly convex; apophysis 

 spherical or otherwise; on green algae and chara- 

 ceans 

 Apophysis spherical, without rhizoids; operculum 



generally umbonate C. brevipes, p. 521 



Apophysis spherical, subspherical, flattened, fusiform, 

 or broadly tubular; rhizoids extensive, stout; 



operculum smooth C. lagenaria, p. 522 



Occurring in marine waters 



Rhizoids branched, broad, often swollen or vesiculate or consisting 



of two saccate branches; on Codium C. codicola, p. 526 



Rhizoids branched or unbranched, delicate; on other marine algae 

 Sporangium subspherical, subangular, pyriform, or urceolate; 



discharge pore apical C. polysiphoniae, p. 526 



Sporangium obpyriform; discharge pore large, generally sub- 

 apical C. megastomum, p 528 



198. 



Chytridium olla Braun 



Betrachtungen uber die Erscheinung der Verjungung in der Natur. . ., p. 

 Leipzig, 1851; Monatsber. Berlin Akad., 1855: 380; Abhandl. 

 " Berlin Akad., 1855: 23, pi. 1, figs. 1-10. 1856 



(Fig. 31 A, p. 496) 



Euchytridium olla (Braun) Sorokin, Arch. Bot. Nord France, 2: 21, fig. 19. 

 1883 (separate). 



Sporangium sessile, rarely stalked, ovoid or somewhat urceolate, 

 11.9-100 (J. high by 10.6-55 \x in diameter, the apex terminated by a 

 broad convex umbonate or occasionally smooth operculum 7-14 \x in 

 diameter, wall smooth, colorless, of varying thickness; rhizoids tenu- 

 ous and much branched within the host contents, arising from a broad 

 often irregularly expanded tubular endobiotic occasionally septate stalk 

 of variable length, which originates at the base of the sporangium but is 



