44 



ZYGNEMATACEAE 



irregular in form and diameter, i. 8-6.5 /x, 1-8-7.2^ apart, brown at 

 maturity. (PI. VII, Fig. 15.) 



China, rice fields, Tong-Kau, North Kwangtung, March 20, 1942. 



Should be near Number 61. 



93. Zygnema ellipsoideum Jao 1947. Bot. Bull. Acad. Stnica. 1, 

 p. 97. 



Vegetative cells 20-22 ju. x 25-40 /n; conjugation unknown; aplan- 

 ospores ellipsoid, with somewhat pointed ends, 15-20^ x 22-25 (-30) m; 

 median spore wall yellow-brown, scrobiculate; sporiferous cells cylin- 

 dric, or somewhat inflated on one side. 



China, Kwangsi, Suijen, May 31, 1938; fairly common in rice fields. 



This is the first species with ellipsoid spores to be described. 



Fig. a. — Zygnema etlipsoideuni aplanospores and sporangia. Figs. B. and C. — 

 Zygnema mirificnm aplanospores, immature and mature. Both figures after Jao. 



94. Zygnema mirificum Jao 1947. Bot. Bull. Acad. Sinica. 1, p. 97. 

 Vegetative cells i5-i8iu, x 25-63 /a; conjugation unknown; outer 



aplanospore wall similar in shape and just inside the dolioform sporan- 

 gium wall, 22-30 /J. x 30-60 /A the median wall varies from ellipsoid to 

 ovoid in the bulge of the outer wall, 20-30 m x 25-30 ju.. The space be- 

 tween the 2 walls is filled with yellowish colloidal material. The 

 median wall is irregularly and minutely scrobiculate, yellow-brown in 

 color. 



China, Kwangsi, Suijen, June 17, 1938; in rice fields, very common. 



This is a new type of 7,ygnema spore, with a colloidal layer between the 

 outer and median walls, and the 2 walls not of the same form. It is probable, 

 however, that the "granulose" surfaces of the median walls of certain other 

 species result from the coagulation of a preceding colloidal layer. 



95. Zygnema khannae Skuja 1949. Nova Acta Soc. Sci. Upsali. 



Ser. 4, 14, p. 99. PI. 22, Figs. 6-7. 

 Vegetative cells 24-28/1 x 30-70/1, conjugation unknown; reproduc- 



