LF.PTOMITACKAE 169 



The following is translated from the original (tiicre arc no figures): 



"Mycelium and sporangia as in yl. laevis. Oogonia terminal, rarely 

 intercalary, mostly on very short side branches, more or less si)herical, 

 with smooth, moderately thick membrane; without pits; 2t,-t,S:x in 

 diameter. Antheridia large, often long, cylindrical, usually several on 

 an oogonium and siMrally wrapping them around, as well as their stalks, 

 later with brown, thickened membrane, and lying isolated on the oogonia 

 on account of the disappearance of their stalks. The antheritlial threads 

 arise in part from special hyphae, in part from those that bear oogonia. 

 They often wind themsehes thickly about each other, and also about 

 other threads, even around those that do not bear oogonia, so that they 

 mav make a thick tangle in the neighborhood of the oogonia. Eggs 

 single, spherical. 23-271J1 thick, with large fat drops, which are mostly 

 on one side, but not always \-isible. 



" Found near Hamburg, and cultivated on ant eggs. 



'The sex organs are developed very richly with the sporangia in 

 conditions where other Aphaiwtnyces species do not develop them. 

 This species is nearly related to A. laevis, and is possibly only a variety 

 of it. However, the long antheridial branches, which often wind about 

 the hyphae, and the often snake-like twisting of the antheridia, would 

 seem to justify the establishment of a new species." 



LEPTOMITACEAE 



Filaments constricted at intervals to form a series of long or short 

 segments; often showing conspicuous particles of material, supposed to 

 be cellulin, which may entirely fill the constriction. Oogonia if present 

 containing a single egg, which is surrounded by periplasm except in 

 Apodachlya. 



The fungi composing this family were included in the Saproleg- 

 niaceae until Schroeter established the family in 1893. Thaxter (1896, 

 p. 324) has called attention to the fact that they are more related to 

 the Pythiaceae than to the Saprolegniaceae. 



Of the species now included in the family we ha\e studied only Lep- 

 tomitus lacteus, Apodachlya brachynema and Sapromyces Reinschii, the 

 former of wide distribution and frequent appearance in collections. For 

 convenience we gi\e below a tabular view of the genera and species now 

 recognized in the Leptomitaceae. 



Gonapodya siliqitaeformis (Reinsch) Thaxter (1895a). See also Petersen ('10, fig. 11). 



Gonapodya polymorplia Thaxter (1895a). See also Petersen ('10, figs. 12-14). 



Leptomiliis lacteus \%. (1824). See below. 



Apodachlya pyrifera Zopf. (1888). 



Apodachlya pyrifera var. macros porangia Tiesenhausen (1912, p. 295, fig. 19). 



