DESCRIPTION OP PLATE III.. 



ILLUSTRATING 



MR. ARCHER'S PAPER ON SAPROLEGNIEiE 



(p. 136). 



Pig. 1. . Chain of four oogonia in Saprolegnia androgyna, sp. nov., showing the 

 lateral male hranchlets emanating from the oogonia ; the two upper oogonia 

 with fully-formed oospores, the lowest but one showing the contents com- 

 mencing to become formed into primordial cells, or oospheres (Befrucht- 

 ungskugeln, Pringsh.)— the future oospores; the lowest oogonium with 

 the granular contents dense, but unchanged. 



,,2. . A single terminal oogonium of Achlya comuta, sp, nov. ; its granular con- 

 tents not yet commenced to be formed into a primordial cell or cells. 



„ 3 and 4. Series of oogonia, the first smaller, and with one oospore each, the latter 

 larger, with a greater (variable) number; to the right of middle oogonium 

 (Fig. 4) is seen a curious depressed lobate form assumed by one of the ex- 

 tensions, instead of the usual tapering cornua. 

 ,,5. . Shows the development of the lateral branch just under an oogonium ; and, 

 ,,6. . Three such branches, two of which have become shut off at their extremities 

 and developed each an oogonium, each with a single oospore. 



[Note. — By an unfortunate oversight the above Plate is referred to in the Paper on 

 Saprolegniese (p. 136), as Plate VI., in place of Plate III.] 



