MILDEWS, RUSTS AND SMUTS 
9 
Saprophytic on dead insects, flies, mealworms, etc., in 
water, also on decaying plants. 
Germany. 
Pythium cytosiphon, Linstedt ; Massee, Brit. Fung., 
P- 134- 
Mycelium rambling amongst the tissues of the host, 
slender, branched, with an occasional septum ; zoosporan¬ 
gia formed in the peripheral cells, globose to cylindrical, 
20 fx diam., up to 240 fx long ; zoospores somewhat kidney¬ 
shaped, biciliate, 8—16 /x ; oospheres terminal or intercalary, 
globose ; oospores singly in the oospheres, globose, with a 
thick, spiny wall; antheridia one to each oosphere. Ger¬ 
mination unknown. 
Syn. Cytosiphon pythioides, Roze and Cornu. 
Parasitic in the tissues of Lemna minor, L. gihha, L. 
arrhiza {=Wolffia arrhiza), and Riccia fluitans. 
Germany. 
Pythium megalacanthum, De Bary ; Massee, Brit. 
Fung., p. 135. 
Mycelium branched, branches tapering, without septa ; 
zoosporangia mostly formed in the epidermal cells of the 
host, or some outside the host, globose, cylindrical or oval, 
often with several beaks, zoospores 12—15 in a sporangium, 
large, 18—20 pL, biciliate ; oospheres terminal or inter¬ 
calary, smooth then spiny, 35—45 pi; oospores globose, 
smooth, 27 pL. 
Parasitic on decaying plants in water. 
Germany. 
Pythium artotrogus, De Bary. 
Mycelium parasitic in the tissues of dead plants ; zoos¬ 
porangia and chlamydospores unknown ; oospheres formed 
in the tissues and also on hyphae on the surface of the 
matrix, globose, mostly intercalary, wall spinulose, 18—27 
pt, diam., spines 3—6 pi long ; antheridia cylindrical; oos¬ 
pore globose with a smooth, yellow wall; germination, 
after a period of three or four months, by the protrusion 
of germ-tubes. 
Syn. Artotrogus hydnosporus, Montague. 
Pythium micracanthium, De Bary. 
Occurring in decaying plant tissues, often in company 
with other species, as in diseased potatoes along with 
Phytophthora infestans, the cause of the well-known potato 
