no Mycetozoa of North America 



Plasmodium opaque white (Lister). Sporangia gregarious, 

 cylindrical, obtuse, 0.7 to 1.2 mm. high, 0.3 to 0.8 mm. broad, 

 stalked, occasionally sessile, iridescent blue, purple, or brown; 

 sporangial wall membranous, hyaline. Stalk white, rarely brown- 

 ish, stout, tapering, brittle, 0.4 to 0.9 mm. high, rising from a 

 well-developed hypothallus, densely charged v/ith round granules 

 or crystalline nodules of lime. Columella cylindrical or narrowed 

 upwards, reaching half-way or nearly to the apex of the spo- 

 rangium, white, charged with lime like the stalk. Capillitium 

 consisting of profusely branched and anastomosing threads 

 connecting the columella with the sporangial wall, dark violet- 

 brown, colorless at the extremities. Spores dull violet, minutely 

 spinulose, 7-9 /x diam. (Plate 15, fig. 5.) 



\ar. globosa Lister, Mycetozoa ed. 2. 118. 1911. 



Sporangia globose. 



Type locality: France. 



Habitat: On dead leaves, twigs, and other ground material. 



Distribution: Common and abundant throughout North 

 America; var. globosa, Connecticut, New York, Quebec. 



Illustration: Lister, Mycetozoa ed. 3. pi. 99, figs. a-c. 



This species is very common and forms large developments in 

 dry places. The stalk varies considerably in length in relation 

 to the sporangium. Usually from one third to one half, it may 

 be longer than the sporangium, or very short and occasionally 

 lacking so that the sporangia are sessile. The sporangia are 

 usually long-cylindrical, but may be shortened, gradually be- 

 coming globose and forming var. globosa. The variety is rare 

 and always accompanied by sporangia more or less cylindrical. 

 This separates them roughly from D. bulbillosa, where the spo- 

 rangia are always uniformly globose. The spores are closeh' and 

 faintly marked with minute spines. 



2. Diachea bulbillosa (Berk. & Br.) Lister, Jour. Bot. 36: 165. 

 1898. 



Didymium bulbillosurn Berk. & Br. Jour. Linn. Soc. 14: 84. 1873. 



Plasmodium white (Lister). Sporangia gregarious, globose, 

 0.3 to 0.5 mm. diam., iridescent blue, purple, or brown, stalked; 

 sporangial wall membranous, colorless. Stalk white, occasion- 

 ally brown, tapering, 0.5 to 1 mm. high, filled with granules or 



