688 AQUATIC PHYCOMYCETES 



B. pringsheimii in having a more conspicuously globose basal cell, the 

 cylindrical stalk often being almost entirely absent. When it is present, 

 however, the habit of the plant closely approximates small specimens 

 of B. pringsheimii. 



Miss Kanouse describes the zoospores as 12-14 [j. in diameter, kidney- 

 shaped to ovoid when swimming, and biflagellate. Only posteriorly 

 uniflagellate ones have been observed by Cotner (loc. cit.) and by Spar- 

 row. 



Blastocladia prolifera Minden 



Kryptogamenfl. Mark Brandenburg, 5:606. 1912(1915); Falck, Mykolog. 

 Untersuch. Berichte, 2(2): 213, text figs. 20-22. 1916 



Basal cell cylindrical, 100-300 \i long by 24-80 \l in diameter, apically 

 divided into subdichotomously or irregularly arranged short branches, 

 setae absent, holdfasts branched; primary sporangia numerous, straight- 

 cylindrical or somewhat curved, basally truncate, 60-150 [i long by 

 13-35 [l in diameter, with a prominent apical papilla, internally prolif- 

 erous (up to five times), secondary sporangia successively smaller; zoo- 

 spores spherical, posteriorly uniflagellate, 5.2 ii in diameter; resting 

 spore not observed. 



On dead plant parts, Minden (loc. cit.), Germany; fruits of apple and 

 Japonica, Crooks (1937: 225, fig. 10 A-B), Australia; fruits of Cornus 

 officinalis Indoh (1940: 254, fig. 1 1), Japan. 



Certain plants mentioned by Crooks (loc. cit.) may be referable to 

 Blastocladia sparrowii. 



Blastocladia angusta Lund 



Kgl. Danske Vidensk. Selsk. Skrift., Naturv. Math., Afd. IX, 6(1): 44, 



fig. 21. 1934 

 (Fig. 47 E, p. 682) 



Basal cell cylindrical, slender, up to 1 50 \x long by 10-35 \x in diameter, 

 the distal part branched (occasionally unbranched), the branches re- 

 maining cylindrical, holdfasts slender, branched, whole thallus 160-500 a 

 long, contents sometimes brownish, setae usually present; sporangia 

 borne at the tips of the branches, narrowly cylindrical, 60-210 u. long by 

 6-25 [x in diameter; zoospores not observed (?), apparently liberated 



