ACHLYA 145 



from the pporangia-bcaring main hyphac; oogonia spherical, rarely 

 c'ltnigattxl by an extonsicm of the tip, and covered with many crowded, 

 blunt, hollow projections; diameter of oogonia SO-cjO'i. with the spines, 

 the latter 7-1 lyi long. Antheridia cylindrical to clavate, small on slender 

 branches, which are little or not at all branched and also not looped, 

 but mostly only bent like a bow, and which are mostly only one to three 

 to an oogonium, and are borne in part from the stalk of the oogonium 

 or its main thread or in part from other threads. _ Eggs spherical, 1-25, 

 mostly about 10, filling the oogonium, 22-27^1 thick. 



"Found in swamp water at Hamburg and Frankreich, and culti- 

 vated on ant eggs. This seems to be Cornu's inadequately described 

 and therefore doubtful species. It ho'ds a middle place between A. 

 polyandra and A. oligacatitha. It is like the former in the bent (though 

 not so much bent) stalk of the oogonium, and like the latter In the papil- 

 late oogonial wall. The outgrowths on the oogonia are here much more 

 numerous than in that species, mostly of about equal length, but rarely 

 one may be more developed than the others." 



The following incomplete diagnosis is all that is given by Cornu: 



"This Achlya is distinguished from others by its spiny oogonia, not 

 pitted, borne on a branch bent in an arch, toward the end of which it 

 arises singly and in general laterally; the lateral branches arising either 

 from the branch or the axis. The number of eggs is usually from six to 

 eight. Sometimes the oogonium bears a cylindrical portion, as mPythiiim, 

 at its upper end." 



Achlya Hoferi Harz. Allg. Fischerei. Zeitung. 31 : 365. 1906. 



The following is abstracted from the original (compare with A. 

 Nowickii in doubtful species, p. 147): 



" Mycelium luxuriant, penetrating deeply into the skin and destroying 

 the tissue, developing on outside numerous zoosporangia and oogonia. 

 Hyphae of very various thickness, 45-60,1. in the thickest part, reaching 

 only lyi in the finest tips. Threads that bear the oogonia and the zoospor- 

 angia 15-18X thick. Sporangia very various in size, 30-100-600'^ long 

 and 5-20yL broad. Zoospores occasionally one-rowed in the sporangia. 

 Usually many-rowed. 



"Oogonia oval or occasionally spherical, 75-i8o;a long, 45-6o:a thick, 

 with numerous, hollow, thorn-like projections which are 6^ broad, 6-1 1;! 

 high, their membrane of the same thickness as that of other parts of the 

 oogonium. Eggs spherical, 20-30^. in diameter, the number varying 

 from several (rarely only one) to over 30; generally about 20. They 

 are colorless, with a hard coat, and very full of fat before ripening, as 

 are also the mycelium and stalks; after complete maturity this fat almost 

 completely disappears. 



"From the various other Saprolegniaceae that grow luxuriantly 

 on live fish, as, for example, Achlya polyandra, A. Hoferi is distinguished 



