CHYTRIDIALES 347 



hyaline, with one large apical pore, containing few (30-40) zoospores. 

 Apophyses endobiotic, connected with sporangium directly or by 

 narrow and very short penetration tube, smaller than zoosporangium, 

 globose, conic, turbinate, or bilaterally elongated, thin-walled, hyaline. 

 Rhizoid extensive, arising from two or three places on the apophysis, 

 laterally or dichotomously branched, containing oil globules at intervals. 

 Zoospores, when mature, rotate for a while in zoosporangium, and then 

 liberate one by one from apical pore, globose, 3.5-4 \x in diameter, with 

 one posterior ftagellum and a refractive globule. Resting spores sphaerical 

 or subsphaerical, sessile, about 10 \x in diameter, borne like the zoo- 

 sporangia, hyaline, smooth, thick-walled, 3-4 times thicker than those 

 of zoosporangia, with a large colorless eccentric globule, germination 

 not observed" (Kobayasi and Ookubo, he. cit.). 

 Parasitic on Bryopsis sp. (marine), Japan. 



Phlyctochytrium cladophorae Kobayasi and Ookubo 

 Bull. Nat. Sci. Mus. (Tokyo), (N.S.), 1 (2), No. 35: 64, fig. 4. 1954 



"Zoosporangia scattered, epibiotic, sessile, ovoid or subsphaerical, 

 22-40 \i high, 30-40 \x in diameter, somewhat thick-walled, smooth, 

 hyaline, without distinct papilla, when matured with one broad pit, 

 or rarely with 2-3 lateral pits, containing numerous zoospores, without 

 discharge tube. Apophyses endobiotic, connected with sporangium by 

 short neck, smaller than zoosporangium, variously sac-shaped, frequently 

 flattened against the host-wall and bilaterally elongated, sending rhizoids 

 from one or several spots. Rhizoids arising from the main axis or two 

 or three places on the apophysis, simple or dichotomously branched, 

 not so long. Zoospores medially sized, spherical or ellipsoidal, 3-5 \x 

 in diameter, with one posterior flagellum and a refractive globule. 

 Resting spores not observed" (Kobayasi and Ookubo, he. cit.). 



Parasitic on Cladophora sp. (marine), Japan. 



Phlyctochytrium semiglobiferum Uebelmesser 

 Arch. f. Mikrobiol., 25: 319, fig. 5. 1956 

 Sporangium spherical, 40-80 \x (up to 500 \l on agar), wall thin and 

 smooth, with two to five prominent, 10 \i broad, hemispherical papillae; 



