178 ENDOSPORE.E. [HEMITRICHIA. 



a network of frequently branching pale grey threads, 2 to 

 5 fji thick, marked with three to five often prominent spiral 

 bands, sometimes smooth, but in many parts beset with numer- 

 ous spines about 2 /x, long ; free ends subclavate, usually 

 spinulose. Spores smooth, pale grey in mass, 6 to 8 /x diam.- 

 Hemiarcyria leiocarpa Cooke, in Ann. Lye. Nat. Hist. N. York, xi., 

 p. 405 (1877); Myx. Brit., p. 88, figs. 252, 255. Hemiarcyria 

 Varneyi Rex, in Proc. Acad. Nat. Sc. Phil. (1891), p. 396. 



Plate LXIV., B. a. sporangia, x 20 ; b. portion of cup of sporangium- 

 wall, x 600 ; c. capillitium, x 600 ; d. spore, x 600 (Maine, U.S.A. : part 

 of type). 



This species is closely allied to H. clavata, differing in the pale 

 colour, in the smooth colourless sporangium-wall, the smooth spores, 

 and in the spinose tracts of the capillitium, which in H. clava.ta is an 

 exceptional character. H. Varneyi Rex has a more elongated spo- 

 rangium and a shorter stalk ; but, in comparing the specimen kindly 

 furnished by Dr. Rex with the type of H. hiocarpa, the other characters 

 appear to be identical. 



Halt. On dead wood. Maine, U.S.A. (L:B.M.147A) ; Kansas 

 slide). 



5. H. Wigandii Lister. Plasmodium rose- red. Sporangia 

 subglobose or turbinate, sessile, rarely shortly stalked, crowded 

 or gregarious, 0'4 to 0*7 mm., opaque or shining, yellow, yellow- 

 brown, or ochraceous ; sporangium-wall membranous, yellow, 

 smooth. Capillitium a tangle of sparingly branched, ochraceous- 

 yellow threads, 3 to 5 /x diam., marked with one to three prominent 

 bands, forming an irregular loose spiral, with few rounded or 

 bulbous free ends. Spores yellow, minutely warted, 9 to 12 /x 

 diam. Hemiarcyria Wigandii Host., Mon., p. 267 (1875); Cooke, 

 Myx. Brit., fig. 232. Acryria Wigandii Mass., Mon., p. 163. 

 Trichia nana Mass., in Journ. R. Micr. Soc. (1889), p. 336 ; 

 Mass., Mon., p. 181. 



Plate LXIV., B. e. sporangia, x 20 ; /. capillitium, x 600; g. spore, 

 x 600 (Germany : Rostafinski's type) ; ft. sporangia, x 20 (United States). 



The type specimen of Trichia nana Mass., from Westbrook, Maine 

 (K. 1164), is H. Wigandii, agreeing perfectly with Rostafinski's type 

 from Freiburg in the loose capillitium, with one or two lax and 

 irregular spiral bands ; the sporangia measure O3 to O5 mm. diam. 

 In extensive gatherings made in Norway, on fir wood, some sporangia 

 have short slender stalks filled with spore-like cells. 



Hob. On dead wood. Germany (Strassb. Herb.) ; Norway (L:B.M. 

 148) ; Mass., U.S.A. (L:B.M.148) ; Maine (K. 1164). 



6. H. Karstenii Lister. Plasmodium ? Sporangia forming 

 elongated, curved plasmodiocarps, O3 to O5 mm. broad, or sub- 

 globose, sessile ; pale brown, red, or purplish-brown ; mass of 

 capillitium and spores yellow or orange-red ; sporangium- wall 

 thickened with deposits of granular matter. Capillitium a tangle 

 of branching yellowish or reddish-brown threads, 3 to 5 /x diam., 



