SAPROLEGNIALES 847 



CALYPTRALEGNIA Coker 



J. Elisha Mitchell Sci. Soc, 42: 219. 1927 

 (Fig. 65 P, p. 836) 



Mycelium composed of hyphae of usual achlyoid type; sporangium 

 opening by the dehiscence of an apical, caplike segment; zoospores 

 encysting within the sporangium, somewhat angular, emerging inter- 

 mittently by swelling of consecutive groups in basipetalous succession, 

 the free cysts each giving rise to a laterally biflagellate zoospore which 

 may encyst and emerge again ; oogonia with one to eight eggs, centric, 

 subcentric, or eccentric; antheridia usually androgynous rarely diclinous. 

 (Modified from Coker and Matthews, 1937.) 



Type species: Calyptralegnia achlyoides (Coker and Couch) Coker. 

 TAXON NOT IN COKER (1923) OR COKER AND MATTHEWS (1937) 



Calyptralegnia riparensis Hohnk 

 Veroff. Inst. Meeresforsch. Bremerhaven, 2: 232, 1 pi. 1953 



APHANOD1CTYON Huneycutt 



J. Elisha Mitchell Sci. Soc, 64: 279. 1948 



(Fig. 66 D, F, p. 842) 



"Mycelium of limited growth, hyphae very slender as in the more 

 delicate species of Aphanomyces, much branched; sporangia variable 

 in shape but predominantly globose to subglobose; spores encysting 

 within the sporangium, emerging separately from their cysts as in 

 Dictyuchus, leaving a net of empty cysts, and swimming in the laterally 

 biflagellate form or germinating in situ by germ tube. Oogonia abundant, 

 containing from one to several thick-walled eggs. All mature cell walls 

 give a cellulose reaction with chloroiodide of zinc" (Huneycutt, loc. 

 cit.). 



Type species: Aphanodictyon papillatum Huneycutt. On keratin sub- 

 strata. 



See also Sparrow (1950). 



