236 Mycetozoa of North America 



20-40 n long. Spores brick-red in mass, pale orange-red by trans- 

 mitted light, minutely warted, 10-12 n diam. (Plate 13, fig. 4.) 



Type locality: New York. 



Habitat: On dead wood. 



Distribution: California, Maine, Massachusetts, New 

 Hampshire, New York, North Carolina, Ontario, *Oregon, 

 Pennsylvania. 



Illustration: Lister, Mycetozoa ed. 3. pi. 163, figs, e-i, as 

 T. Botrytis. 



This species is fairly common in many areas, and is usually in 

 large colonies with many sporangia. It resembles Hemitrichia 

 Vesparium in appearance, but is readily distinguished from that 

 and all other species by the characters given. 



Genus 39. OLIGONEMA Rostafinski, Mon. 291. 1875. 



Sporangia small, yellow, clustered or heaped; capillitium 

 usually scanty, of short or long threads with spiral markings 

 obscure or wanting; spores reticulate. 



Type species: Trichia nitens Lib. 



The two members of the genus are allied to Trichia favoginea, 

 T. affinis, and T. persimilis, differing principally in the absence 

 of the continuous, spiral thickenings on the threads of the capil- 

 litium. When spiral windings are present, they are indistinct, or 

 in the form of warts. 



Sporangial wall smooth ; spores irregularly reticulate. 1 . 0. nitens 



Sporangial wall with minute granular thickenings; spores 



regularly reticulate. 2. O.flavidum 



1. Oligonema nitens (Lib.) Rost. Mon. 291. 1875. 



Trichia nitens Lib. PI. Crypt. Ard. (Fasc. 3) wo. 277. 1834. 



Plasmodium watery white (Lister). Sporangia subglobose, 

 sessile, heaped together for the most part in large clusters, 0.2 to 

 0.5 mm. diam., shining yellow or olivaceous yellow; sporangial 

 wall membranous, yellow, smooth, except for scattered curved 

 thickenings enclosing a thinner membrane. Capillitium usually 

 of short, cylindrical, simple, branched, or ring-shaped, yellow 

 threads 3-5 m diam., with rounded or abruptly pointed ends, either 

 smooth or with one to four irregular and indistinct sinistral 

 markings, winding like the threads of a left-handed screw, occa- 

 sionally marked with ring-shaped thickenings and scattered 



