186 ENDOSPOEE^. [aRCYEIA. 



This species is represented by two gatherings from California by 

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

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

 names A. viteUina Phill. and A. versicolor PhUl., but as they agree in 

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

 closely aUied to A. fermginea, from the pale form of which it only 

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

 and the smoother spores. 



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



3. A. albida Pars., in Rijmer, N. Mag. Bot., i., p. 90 (1794). 

 Plasmodium grey, in rotten wood. Total height 0'8 to 4 mm. 

 Sporangia ovoid, more rarely globose or cylindrical, stipitate, 

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

 sometimes duU yellow ; oup of the sporangium-wall membranous, 

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

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

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

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

 threads ; the outer threads 2 /j., rately 4 ;«. thick, closely warted 

 or spinulose, those composing the inner part of the network 

 4 to 6 /[* thick, smooth or minutely warted, with numerous at- 

 tachments to the cup. Spores marked with a few scattered 

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

 (1791). Stemonitis cinerea G-mel., Syst. Nat., p. 1467. Arcyria 

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

 ii., p. 213 (1803); Eost., 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 BuU. Nat. Hist. Iowa, ii., 

 p. 123; Mass., Mon., p. 151. Arcyria striata E,ost., Mon., App., 

 p. 36. Arcyria pomiformis Eost., 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 Schwein., Trans. Am. Phil. Soc, New Ser. 4, 

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

 Arcyria globosa Schwein., in Oomm. Soc. Nat. Our. Lips., i., 

 p. 66. Lachnoholus globosus Eost., Mon., p. 283 ; Mass., Mon., 

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



a. genuina : sporangia ovoid, grey. 



13. pomiformis : sporangia globose, yellow. — A. pomiformis 

 Eost. 



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

 Laehnoholus globosus Eost. 



Plate LXVII., 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' ^ 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 LachndboVas globosus Kost., on chestnut bur, x 20 ; li. 

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

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



