594 AQUATIC PHYCOMYCETES 



Resting spore light to dark amber, spherical 4-60 u. diameter, ovoid 

 4 x 6 — 50 X 65 [x, or elongated, 10x35 \x, thick- walled, smooth, layer- 

 ed, or with outer coat rather irregular, usually with one large refractive 

 globule and numerous smaller ones; zoosporangia formed by direct 

 germination of the resting spore, spherical, pyriform, ovate, etc., usually 

 smaller than the resting spore, those formed indirectly at the end of a 

 tube oval, round, pyriform or clavate; tube wide and saccate or narrow 

 and long with twists and coils, 7-26 \x x 10-450 u." (Berdan, loc. cit.). 

 Saprophytic on various grasses, wheat, rye, oats and corn leaves 

 and narcissus root tips, United States, Canada; Karling (1941a: 387; 

 1942 c: 620; 1948c: 510), United States; grass-leaf bait, from soil, 

 Sparrow (1952b: 69), Cuba. 



Septochytrium marilandicum Karling 

 Bull. Torrey Bot. Club, 78: 39, figs. 9-30. 1951 



Rhizomycelium profuse, much branched, coarse, rarely septate or 

 trabeculate, 8-1 7 u. in diameter, with large broadly or narrowly fusiform 

 or variously shaped intercalary enlargements, bearing slender rhizoids, 

 with occasional anastomoses; sporangia predominantly oval, 30-60 by 

 40-80 u., broadly pyriform, sometimes spherical, 25-60 u., rarely apoph- 

 ysate, usually with their long axis at right angles to the concomitant 

 rhizoidal axis, with a long (up to 1400 u.) curved, coiled or contorted, 

 simple or branched, occasionally very short discharge tube; operculum 

 slightly sunken, 6-1 8 u, in diameter; zoospores spherical, 3.8-4.7 [x, with 

 numerous minute refractive granules and 24-27 u. long flagellum ; rest- 

 ing spores not observed. 



In vegetable debris, United States. 



The species merits distinction by reason of its usually well-developed 

 discharge tubes. While Karling emphasizes, as a differentiating feature, 

 the numerous granules (instead of a single large one) in the zoospore, 

 this is also true of Septochytrium plurilobulum. Although S. marilandicum 

 is said to be endooperculate, the figures show a true operculum, sur- 

 rounded by a narrow collar of wall material. From the great rarity of 

 the septae and trabeculae the fungus gives the appearance of being a 

 species of Nowakowskiella. 



