880 AQUATIC PHYCOMYCETES 



27-31.5 u. in diameter, borne at the tip of a short, two-linked lateral 

 branch arising from the middle of a segment, the antheridium being a 

 lateral link of the same hypha or apparently arising laterally from the 

 same main axis; oospore spherical, filling the oogonium, 25-33 jjl in 

 diameter, with a smooth thick colorless wall and two or more globules, 

 germination not observed. 



On twigs of Picea excelsa, Tiesenhausen (he. cit.), Switzerland; 

 Fraxinus twigs, Sparrow (1932b: 295), United States; twigs, Lund 

 (1934: 33), Denmark. 



Although the form, so far as now known, differs primarily in the 

 larger size of the sporangia, a more careful study of the sex organs may 

 reveal other features of divergence. Deviation in size of sporangia alone 

 hardly warrants varietal rank in this group of fungi. 



Apodachlya seriata Lund 



Kgl. Danske Vidensk. Selsk. Skrift., Naturv. Math., Afd. IX, 6(1): 34, fig. 14. 



1934 



"Hyphae branched, constricted into segments, which are 42.5-100 x 

 5-10 [l, mostly 70-80 :■: 5-8 \i. Sporangia pyriform, oval, or subcylin- 

 drical 35-97 x 15-25 \l, generally 50-60 X 20 [x, terminal on main 

 hyphae, more rarely on lateral branches, or in rows up to four. Zoo- 

 spores 10-12 (jl in diameter, about 26 in a sporangium ; escaping through 

 a short apical exit tube, encysting in a hollow sphere at the mouth of the 

 sporangium. Resting spores (oogonia?) spherical, 27-32.5 \x in diameter, 

 generally borne on short side branches, composed of one to few short 

 segments. 1 oospore (?). Antheridia possibly present" (Lund, he. cit.). 



On twigs of Alnus, Denmark. 



Characterized by long sporangia, which are often in basipetal series. 



Apodachlya punctata Minden 



Kryptogamenfl. Mark Brandenburg, 5: 586, fig. 15 b-d (p. 580). 1912 (1915) 



(Fig. 69 G-H, p. 875) 



Mycelium like that of Apodachlya pyrifera, forming a whitish turf; 

 sporangia spherical, subspherical, ovoid to pyriform, terminal or sym- 

 podially arranged, numerous, discharge tube usually lateral or even 



