122 THE SAPROLEGNIACE^ OF THE UNITED STATES, 



A^ar. GLOBOSA var. no v. 



111. PI. XIX, Figs. 90, 91. 



Oogonial branches very short ; oogonia globular ; oospores reaching twenty-five 

 in number, averaging ten to fifteen ; otherwise as in the type. 



Pennsylvania — Philadelphia, Keller : Alabama — Auburn, Atkinson. 



While not sufficiently different to be considered specifically distinct, this is cer- 

 tainly a well-defined variety of A. oblongata, marked by the very constant distinctions 

 above indicated. It has been received from two widely separated localities, and 

 appears to remain constant in culture. The oogonia are commonly larger than in the 

 type and the space unoccupied by spores is much more marked (Fig. 90), sometimes 

 amounting to more than half of the cavity. The antheridia correspond completely 

 with those of the type, and furnish the best grounds for regarding the differences as 

 of only varietal value. 



This species shows no marked affinity with any other single species of Achlya, 

 and its insertion at any particular point in the series is comparatively arbitrary. 'No 

 real indication of affinities is possible in a linear arrangement of these species. 



Achlya racemosa Hildeb. ('67). 



Syn.: A. Ugnicola Hildeb. ('67). 111.: Hildebrand, '67, PI. XV, Figs. 1-9, and XVI, l-6a. 



Cornu, '72, PI. I, Figs. 2-8. 

 PL XIX, Figs. 92-95. 



Hyphse robust. Zoosporangia nearly cylindrical, sometimes tapering. Oogonial 

 branches racemosely arranged, short and straight. Oogonia globular, their walls 

 smooth and unpitted, somewhat irregularly thickened withiu, brownish-yellow when 

 old. Antheridial branches very short and simple, arising from the oogonial branches 

 near the basal walls of the oogonia, either above or below them. Antheridia one or 

 two, rarely three or four, to each oogonium, short-clavate, usually bent, and applied 

 by their apices to its wall. Oospores one to ten, commonly two to six, in an oogo- 

 nium, centric, their average diameter about 25;i. 



Massachusetts — Amherst. Eui-ope. 



The typical form of the species, which was studied by Hildebrand, has appeared 

 in two cultuies in Amherst, one from dead leaves and slime from the outlet of a 



