CHYTRWIALES 



411 



A 



s^-h 



PI 



(o> 



5 ?.. 



/; 



, o .' 



... Q " S c ^ ' o 



C 



D 



Fig. 25. Rhizidiaceae 



/4-Z>. Nowakowskia hormothecae Borzi parasitic on Hormotheca: A, nearly 

 mature thallus; one branch of rhizoids is in contact with a host cell (/z); B, 

 mass of zoospores liberated upon dissolution of sporangium wall; C-D, 

 stages in separation of zoospores from mass. E-G. Rhizidium nowakowskii 

 Karling: E, discharging zoosporangium; the zoospores are escaping from 

 slime mass in which they were imbedded at discharge; F, early stage in for- 

 mation of zoosporangium at germination of resting spore; G, discharge of 

 zoospores from zoosporangium formed at germination of resting spore. H. 

 Sporophlyctidium africanum Sparrow on cell of Protoderma; one sporangium 

 has just discharged spores which rest near orifice; two other empty sporangia 

 are also shown. /-/. Rhizidium ramosum Sparrow in insect exuviae, two stages 

 in discharge of short-stalked sporangia. 



(A-D, Borzi, 1885; E-G, Nowakowski, 1876a; H, Sparrow, 1938a; I-J, 

 Sparrow, 1937a) 



