350 AQUATIC PHYCOMYCETES 



papillae and a third humplike thick-walled persistent one which is the 

 wall of the original spore cyst, sometimes reduced to a simple upright 

 saccate structure with one discharge papilla, intermediate forms com- 

 mon ; endobiotic system composed of one (rarely two) spherical, sub- 

 spherical, or somewhat saccate, pronounced apophysis (typically smaller 

 than the sporangium but in reduced sporangia equaling or exceeding 

 it in breadth) and main axis of the branched rhizoidal system arising from 

 the base of apophysis; zoospores spherical or oval, about 5 \x in diam- 

 eter, 1 with a single, usually eccentric oil droplet and posteriorly 

 directed flagellum, escaping individually through pores formed upon 

 deliquescence of the two (sometimes only one) functional papillae; 

 resting spore not observed with certainty. 



On Vaucheria intermedia, V. compacta, V. thuretii, saline water, 

 Germany. 



IMPERFECTLY KNOWN SPECIES OF PHLYCTOCHYTRIUM 



? Phlyctochytrium autrani de Wildeman 

 Bull. Soc. Roy. Bot. Belg. (Mem.), 35: 46. 1896 



Rhizidium (?) autrani de Wildeman, Ann. Soc. Beige Micro. (Mem.), 19: 

 72, pi. 2, figs. 17-21. 1895. 



Epibiotic body consisting of a terminal globular structure with a 

 slightly elevated apical pore and a basal ovoid-elongate generally 

 clavate part, the two united by a short or somewhat elongate con- 

 stricted isthmus; rhizoid consisting of an endobiotic needle-like stalk; 

 zoospores and resting spore not observed. 



On Cosmarium, Switzerland. 



The species may ultimately be referred to Scherffeliomyces. 



? Phlyctochytrium catenatum (Dang.) Schroeter 

 Engler and Prantl, Naturlichen Pflanzenfam., 1 (1): 79. 1892 

 Rhizidium catenatum Dangeard, Le Botaniste, 1 : 65, pi. 3, fig. 24 a-b. 1889. 



Sporangium obpyriform, with three or four lateral or basal swellings 

 on its outer surface, wall colorless, relatively thick ; rhizoids branched, 



1 No dimensions are given in the text. They must be calculated from the drawings 

 and scales given. 



