Hemitrichia 243 



Illustration: Lister, Mycetozoa ed. 3. pi. 168, figs, a, b. 



This species superficially resembles Arcyria cinerea, but is a 

 Hemitrichia, as shown by a specimen collected by the late Mr. 

 Hugo Bilgram near Philadelphia. It has prominent, continuous, 

 spiral bands, that wind as thickenings around the threads in a 

 dextral direction. 



5. Hemitrichia abietina (Wigand) Lister, Mycetozoa ed. 2. 227. 



191L 



Trichia abietina Wigand, Jahrb. Wiss. Bot. 3: 33. 1863. 

 Hemitrichia ovata Macbr. N. A. Slime-Moulds 202. 1899. 



Plasmodium rose-red (Lister). Sporangia crowded or gre- 

 garious, short-stalked, rarely sessile, subglobose or turbinate, 

 rarely short-cylindrical, 0.3 to 0.7 mm. diam., usually shining 

 yellow, or ochraceous; sporangial wall membranous, thin, irides- 

 cent, yellow, almost smooth, usually evanescent above and form- 

 ing a persistent cup below. Stalks ochraceous, 0.1 to 0.3 mm. 

 long, filled with spore-like cells. Capillitium a tangle of flaccid, 

 sparingly branched, ochraceous yellow threads 3-5 n diam., 

 marked with from one to three, slender, prominent bands forming 

 irregular, loose, sinistral spirals, with few rounded or bulbous free 

 ends. Spores yellow, minutely warted, 9-12 n diam. 



Type locality: Germany. 



Habitat: On dead wood. 



Distribution: *California, Colorado, Maine, Massachusetts, 

 New York, *Ohio, Ontario, Oregon, Pennsylvania, Quebec, Ver- 

 mont, Virginia. 



Illustration: Lister, Mycetozoa ed. 3. pi. 168, figs. c-e. 



This species is not rare and has been found repeatedly in areas 

 where it is known to develop. In nearly all specimens here, the 

 sporangia are stalked, and usually have three bands on the threads 

 of the capillitium. 



6. Hemitrichia Karstenii (Rost.) Lister, Mycetozoa 178. 1894. 



Hemiarcyria Karstenii Rost. Mon. App. 41. 1876. 



Hemiarcyria obscura Rex, Proc. Acad. Nat. Sc. Phila. 1891: 395. 1891. 



Plasmodium watery white (Lister). Sporangia sessile, scat- 

 tered, subglobose or forming elongate curved plasmodiocarps, 

 0.25 to 0.5 mm. broad, yellowish brown, red, or purplish brown; 



