178 ENDOSPOREiE. [hEMITRICHIA. 



a network of frequently branching pale grey threads, 2 to 

 5 /A thick, marked with three to five often prominent spiral 

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

 ous spines about 2 ft long ; free ends subclavate, usually 

 spinulose. Spores smooth, pale grey in mas^,^ 6 to 8 /* diam. — 

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

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

 Varneyi Eex, in Proc. Acad. Nat. Sc. PhU. (1891), p. 396. 



Plate LXIV,, B. — a. sporangia, x 20 ; J. 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 S. clavata is an 

 exceptional character. M. Varneyi Eex 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. leiocarpa, the other characters 

 appear to be identical. 



Hah. On dead wood. — ^Maine, U.S.A. (L:B.M.147a) ; Kansas 

 (L:B.M.147a 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, yeUow, yeUow- 

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

 smooth. OapiUitium a tangle of sparingly branched, ochraceous- 

 yellow threads, 3 to 5 ju, 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 /i 

 diam. — Hemia/royria Wigandii Rost., Mon., p. 267 (1875) ; Cooke, 

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

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

 Mass., Mon., p. 181. 



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

 X 600 (Germany : Eostafiuski's type) ; h. sporangia, x 20 (United States). 



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

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

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

 irregular spiral bands ; the sporangia measure 0'3 to 0-5 mm. diam. 

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

 have short slender stalks filled with spore-like cells. 



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

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



I 



6. H. Karstenii Lister. Plasmodium ? Sporangia formingf 

 elongated, curved plasmodiocarps, O'S to 0'5 mm. broad, or sub- 

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

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

 tMckened with deposits of granular matter. Capillitium a tangle 

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



