LEPTO MIT ALES 877 



or several, sympodially arranged or in clusters, subspherical, ovoid, 

 ellipsoidal, or pyriform, with an apical, subapical, or lateral somewhat 

 prolonged discharge papilla, 23-76 \x long by 23-44 \x in diameter; 

 zoospores from six to twenty, primary spores broadly ovoid, 12-14 \i 

 (long?), apically biflagellate, swimming directly from the sporangium 

 before encysting, cysts spherical, 8.5-10 [i in diameter, secondary zoo- 

 spores biflagellate; oogonia spherical or broadly pyriform, 23.5-29 \i 

 in diameter, terminal, borne singly at the tips of short lateral moniliform 

 segments, the subapical segment functioning as the antheridium; 

 oospore single, 20-40 [i in diameter, filling the oogonium, wall smooth, 

 about 1.8 [i thick, contents finely granular, with small regularly disposed 

 globules, a vacuole, and from one to two large eccentric globules, upon 

 germination producing a germ tube (?). 



On twigs, Hildebrand (be. cit), Hohnk (1938: 491, figs. 1,2), Ger- 

 many; Thaxter (1896b: 325), termite, Coker (1923: 173, pi. 59), fruits 

 of apple and Crataegus, Kanouse (1927:338), Harvey (1930:327), 

 apples and twigs, Sparrow (1932b: 296; 1933c: 532), Wolf (1944: 44), 

 United States; twigs of Primus yedoensis, P. grayana, Quercus sp., 

 Indoh (1953: 26, figs. 13, 14), Japan; decaying culm, Shen and Siang 

 (1948: 198), China; various twigs, Barbier (1950: 28, figs. 1-12), 

 France. 



Kevorkian (1935:279) mentions that the oospores of Apodachlya 

 brachynema germinate, presumably by a germ tube, but no details of 

 the process are given. The cytological details of fertilization and the 

 role played by the subterminal antheridium have been described 

 (Kevorkian, loc. cit.). 



Apodachlya brachynema f. major, stat. nov. 



Apodachlya brachynema var. major Tiesenhausen, Arch. f. Hydrobiol. u. 

 Planktonk., 7(2): 297, fig. 20. 1912. 



Mycelium little branched, hyphae 6-13 \x in diameter, segments 

 15-537 [i long; sporangia spherical, rarely elongate, 40-52 [i (long?), 

 discharge tube large, 10-20 [jl long by 6-10 [i in diameter; zoospores 

 not observed; oospore spherical, 25-30 jj. in diameter. 



On twigs, Switzerland. 



