368 AQUATIC PHYCOMYCETES 



CORALLIOCHYTRIUM Domjan 



Folia cryptogam., 2 (1): 22. 1936 

 (Fig. 21 H-J, p. 360) 



Thallus extramatrical, epi- and endobiotic, monocentric, eucarpic, 

 the epibiotic part forming the rudiment of the sporangium from the 

 enlarged extramatrical part of the germ tube of the encysted zoospore, 

 the endobiotic part forming a subsporangial apophysis from the base 

 of which emerges a single short rhizoid bearing at its tip a complex of 

 stubby, thick, branched digitations; sporangium inoperculate, epibiotic, 

 sessile, the cyst of the zoospore attached to it directly or by a short 

 tube, forming more than one discharge papilla ; resting spore epibiotic, 

 apparently asexually produced, borne within a structure formed like 

 and resembling a sporangium, germination not observed. 



On Zygnema. 



The genus bears a marked similarity in its method of development 

 to Scherffeliomyces. It differs, however, in the character of the haus- 

 torial system and the method of zoospore discharge (through several 

 openings). 



Johns (1956) gives evidence to show that Coralliochytrium should, 

 in fact, be merged with Scherffeliomyces and he has placed Domjan's 

 C. scherffelii in Sparrow's genus under the binomial Scherffeliomyces 

 scherffelii (Domjan) Johns. 



Coralliochytrium scherffelii Domjan 

 Folia cryptogam., 2 (1): 22, pi. 1, figs. 5-12, 14-23, 27-35, 38-41, 47, 49. 1936 



Sporangium sessile, somewhat irregularly angular-pyriform (polygonal 

 in cross section at the base), the shape depending in part upon the 

 number (from two to five) of broad very prominent elongate discharge 

 papillae formed, 15.4-23.8 \x broad by 17.6-23.8 \x high (majority 22 \x 

 in breadth), wall smooth, thick, colorless, bearing at the apex the cyst 

 of the zoospore and its connective; subsporangial endobiotic apophysis 

 bulbous, 3.3-4.4 u, in diameter, lateral walls thick, base generally thin- 

 walled, the delicate basal rhizoid bearing distally the broad stubby 

 digitations; zoospores spherical, 2.2 jji in diameter, with a colorless 



