— 439 — 

 Explanation of the figures. 



Fig. I. u, Saprolegnia monoica; b, Saprolegnia Thureti, a, zoosporangium-sha- 

 ped oogonium; c, Saprolegnia dioica; d and e, Saprolegnia paradoxa; /, 

 Sapiol. semidioica. 



Fig. II. o, Le])tolegnia caudata; a, the zoospores moving in the hyphfe before 

 the coming out; b, c, d and e, stages in alteration of form of the zoos- 

 pores, e, the last stage. 



Fig. III. a and e, Achhja decorata; the ripe oospore is seen to the right in a, 

 e, a stage of the evolution of the spines resembling the stage of forma 

 stelligera of Achlya racemosa; b and f, Aphanomyces coniger, the antheri- 

 dial tubes are seen; c, Aphanomyces Icevis; d, Achlya racemosa forma 

 stelligera; g, Achlya polyandra; h, Saprolegnia asterophora ; i, Achlya 

 racemosa. 



Fig. IV. a and e, Rhipidium continuum; h, c and d, Sapromyces Reinschii; in 

 c the basal cell is shown; in d an oogonium with an antheridial tube. 



Fig. V. Sapromyces shaped vegetative form. 



Fig. "VI and VII. Pythiomorpha gonapodyides ; VI, «, a zoosporangium ; in b and 

 c the manner of renewal of the zoosporangia is shown. 



Fig. VIII. a and d, Pythium undulatum, a mycelium with three zoosporangia; 

 b, germinating zoospore of Pythium Daphnidarum in Bosmina; c and /", 

 resting spores of indeterminate Pythium species in the tissues of higher 

 plants, e, Pythium proliferum, renewal of the zoosporangia. 



Fig. IX. Pythium undulatum. 



Fig. X. Blastocladia Pringsheimii; the different forms are shown. 



Fig. XL Gonap)odya siliquceformis. 



Fig. XII. Gonapodya polymori)ha; the zoosporangia marked with an asterisc are 

 respectively 5'2 and 74/^ long. 



Fig. XIII. Gonapodya polymorpha. 



Fig. XIV. Gonapodya polymorpha; zoospores which are transformed into re- 

 sting spores. 



Fig. XV. a and b, Monoblepharis brachyandra, c, Monoblepharis polymorpha 

 var. macranda. 



Fig. XVI. a, Myzocytium irregulare in Micrasterias, d, in Gosmarium; b, Lage- 

 nidium Zopfii; c, Lagenidium entophytum (the membrane of the host not 

 shown) e, Myzocytium proliferum in Mougeotia; f, Ancylistes Glosterii. 



Fig. XVII. Olpidiopsis Aphanomycis. 



Fig. XVIII. a, Olpidiopsis echinata, oogonium with antheridial cell; b, Olpidi- 

 opsis Saprolegnice, two oogonia with one antheridial cell; g, Olpidiopsis 

 minor, oogonium with antheridial cell; c and e, zoosporangia of parasites 

 in Saprolegniacean hyphae; d, Pseudolpidium Saprolegnice in Achlya race- 

 mosa, f, Pseudolpidium fusiforme. 



Fig. XIX. Chytridium spinulosum, a and b, zoosporangia and resting spores 

 (intramatrically), c, an opened zoosporangium ; d, a resting spore in con- 

 nection with mycelium. 



Fig. XX. a, Cladochytrium tenue; b, Rhizophlyctis sp. in Draparnaldia sp.; c 

 and d, resting spore and zoosporangium of Entophlyctis heliomorpha. 



Fig. XXI. a, Indeterminate Ghytridinean in putrid wood ; b and d, Siphonaria 

 variabilis, b, the act of copulation ; c, Khizoclosmatium globosum; e, Astero- 

 phlyctis sarcoptoides. 



