MUCILAGO 133 



Type locality: Colorado. 



Habitat: On dead leaves and twigs. 



Distribution: Colorado. 



Illustration: Lister, Mycetozoa ed. 3. pi. 221. 



This species is based on a single large and perfect collection 

 made by Dr. W. C. Sturgis in Colorado in 1913, and so far as I 

 know it has not been found since. It does not seem to be clearly 

 related to any other species. If found again there should be no 

 difficulty in recognizing it, as there are but two sessile forms of 

 Didymium with yellow lime, and the other one, D. ochroideum, is 

 distinguished as mentioned under that species. 



20. Didymium intermedium Schroet. ; P. Henn. Hedwigia 35: 

 209. 1896. 



Plasmodium? Sporangia gregarious or clustered, stalked, 

 discoid, convex above, widely and deeply umbilicate beneath, 

 often lobed or sinuous, 0.5 to 1 mm. diam., grayish white; 

 sporangial wall membranous, clothed with deposits of lime- 

 crystals. Stalk 0.7 to 1 mm. long, yellowish white or buff, 

 smooth, broad at the base and tapering upward, filled, like the 

 columella, with crystalline nodules of lime. Columella convex, 

 discoid, pale yellow or white, formed by a shallow thickening 

 of the base of the sporangial wall, recurved at the margin owing 

 to the deeply umbilicate character of the sporangium. Capil- 

 litium of simple or branched, slender, colorless threads. Spores 

 dark purple-brown, 9-12 /x diam., marked with a close, irregular 

 reticulation of minute ridges, making a border about 0.7 /i deep. 



Type locality: Brazil. 



Habitat: On dead leaves and herbaceous stems. 



Distribution: *California, *Canal Zone. 



Illustration: Lister, Mycetozoa ed. 3. pi. 110, figs. d-f. 



Related somewhat to D. squamulosum, but rnust not be con- 

 fused with phases of the latter having dark spores, as the spo- 

 rangia and spores of D. intermedium are entirely different. 



Genus 12. MUCILAGO Micheli; Adanson, Fam. PI. 2: 7. 

 1763. 



Sporangia confluent to form an aethalium, otherwise with 

 the characters of the genus Didymium. 

 A single species. 



