Hemitrichia 241 



end to end, and profusely twisted, so that many long, twisted 

 projections spread from the mass and appear as free ends. The 

 species can be recognized with a hand-lens. 



3. Hemitrichia clavata (Pers.) Rost. Versuch 14. 1873. 



Trichia clavata Pers. Neues Mag. Bot. 1: 90. 1794. 



Hemiarcyria stipitata Massee, Jour. Roy. Micr. Soc. 1889: 354. 1889. 



Hemiarcyria plumosa Morg. Jour. Cin. Soc, Nat. Hist. 16: 23. 1893. (N. Y. 



B. G. nos. 5969, 12159, type material.) 

 Hemiarcyria ablata Morg. Jour. Cin. Soc. Nat. Hist. 16: 24. 1893. (N. Y. 



B. G. no. 5962, type material.) 

 Hemiarcyria funalis Morg. Jour. Cin. Soc. Nat. Hist. 16: 26. 1893. (N. Y. 



B. G. no. 6674, type material.) 

 Hemiarcyria montana Morg. Jour. Cin. Soc. Nat. Hist. 18: 40. 1895. 

 Hemitrichia stipitata Massee;. Macbr. N. A. Slime-Moulds 207. 1899. 

 Hemitrichia montana Morg.; Macbr. N. A. Slime-Moulds 208. 1899; Macbr. 



& Martin, Myxomycetes 298. 1934; Martin, Mycologia 34: 699. 1942. 



(N. Y. B. G. no. 13238, det. G. W. Martin.) 



Plasmodium watery white or rose-red (Lister). Total height 

 1 to 3 mm. Sporangia stalked, gregarious or crowded, clavate or 

 turbinate, 0.7 to 1.5 mm. high, shining ochraceous or olivaceous 

 yellow, globose and nearly sessile in irregular developments; 

 sporangial wall membranous, minutely papillose on the inner side, 

 rarely reticulate, yellow, evanescent above, persistent below to 

 form a more or less definite cup. Stalk cylindrical, 0,1 to 1.5 mm, 

 long, furrowed or nearly even, olive, reddish brown, or nearly 

 black, filled with spore-like cells, Capillitium an expanding net- 

 work of yellowish olive, branched threads 5-6 ^l diam., with or 

 without free ends, marked with five or six well-defined close or lax 

 sinistral, spiral bands, sometimes spinose in imperfect develop- 

 ments. Spores pale yellow, minutely warted, 7-9 n diam. 

 (Plate 14, fig. 1.) 



Type locality: Europe. 



Habitat: On dead wood. 



Distribution: Common and abundant throughout North 

 America. 



Illustration: Lister, Mycetozoa ed. 3. pi. 167. 



This species is subject to variation depending on moisture and 

 temperature, and the attending factors of latitude and altitude. 

 During the warm days of summer, a graceful form will develop 

 with long, thin stalks, and small cups. It is illustrated by Lister 

 on pi. 167, as fig. f. This is the common form from the tropics, 



