186 ENDOSPORE/E. [ARCYRIA. 



This species is represented by two gatherings from California by 

 Dr. Harkness (K. 839, 897) ; in one the sporangia and capillitium are 

 bright yellow, in the other dull yellow ; they received respectively the 

 names A. vitelU'iia Phill. and A. versicolor Phill., but as they agree in 

 other respects they are united under the latter name. A. versicolor is 

 closely allied to A. ferruginea, from the pale form of which it only 

 differs in shape, in the papillose thickenings of the sporangium-wall, 

 and the smoother spores. 



Hal. On dead wood. California (L:B.M.154). 



3. A. albida Pers., in Homer, N. Mag. Bot., i., p. 90 (1794). 

 Plasmodium grey, in rotten wood. Total height O'S to 4 mm. 

 Sporangia ovoid, more rarely globose or cylindrical, stipitate, 

 erect, 0*5 to 1*2 mm. diain., pale grey or greyish flesh-colour, 

 sometimes dull yellow ; cup of the sporangium-wall membranous, 

 smooth or minutely papillose, plaited at the base, pale grey or 

 yellowish. Stalk cylindrical, furrowed, O2 to 2 mm. long, 0-05 

 to 0'15 mm. thick, dark grey or brown, hollow, filled with spore- 

 like cells. Capillitium a close network of grey or yellowish-grey 

 threads ; the outer threads 2 //,, rarely 4 ju, thick, closely warterl 

 or spinulose, those composing the inner part of the network 

 4 to 6 fji thick, smooth or minutely warted, with numerous at- 

 tachments to the cup. Spores marked with a few scattered 

 warts, 6 to 7 /x, diam. Trichia cinerea Bull., Champ., p. 120 

 (1791). Stemonitis cinerea Grnel., Syst. Nat., p. 1467. Arcyria 

 cinerea Pers., Syn. Fung., p. 184 (1801) ; Schum., En. PI. Saell., 

 ii., p. 213 (1803) ; Host., Mon., p. 272 ; Cooke, Myx. Brit., 

 p. 71, figs. 182, 183, 184, 185, 193; Blytt, Bidr. K. Norg., 

 Sop. iii. (1892), p. 11 ; Macbride, in Bull. Nat. Hist. Iowa, ii., 

 p. 123; Mass., Mon., p. 151. Arcyria stricta Host., Mon., App., 

 p. 36. Arcyria pomiformis Host., Mon., p. 271 ; Cooke, Myx. 

 Brit., p. 70. Arcyria Friesii Berk. & Br., in Ann. Mag. Nat. 

 Hist., Ser. 4, xvii., p. 140; Cooke, Myx. Brit., p. 71, fig. 259. 

 Stemonitis digitata Schweiii., Trans. Am. Phil. Soc., New r Ser. 4, 

 p. 260. Arcyria digitata Host., Mon., p. 274 ; Mass., Mon., p. 153. 

 Arcyria globosa Schwein., in Comm. Soc. Nat. Cur. Lips., i., 

 p. 66. Lachnobolus globosus Host., Mon., p. 283 ; Mass., Mon., 

 p. 137. Arcyria Cookei Mass., Mon., p. 154. 



a. genuina : sporangia ovoid, grey. 



/?. pomiformis : sporangia globose, yellow. A. pomiformis 

 Host. 



y. globosa : sporangia globose, white or pale ochraceous. 

 Lachnobolus globosus Host. 



Plate LXVIL, B. a, b. sporangia, x 20 ; c. globose sporangium on 

 bramble, x 20 ; d, d '. outer capillitium of a, often with half -rings and 

 coarse spines on one side, d x 280, d' x 600 ; e, e'. outer capillitium of the 

 more usual form, with minute spines equally distributed ; and smooth thread 

 attached to sporangium-wall, e x 280, e' x 600 ; /. spore, x 600 (England) ; 

 g. sporangium of Lachnobolus globosus Eost., on chestnut bur, x 20 ; Ii. 

 capillitium of same, x 600 (United States) ; i. sporangium of Lachnobolus 

 globosus var. minor Ellis ; on male flower of chestnut, x 20 (United States). 



