74 ENDOSPOEE^. [CRATERIUM. 



Scotland (K. 299) ; France (Paris Herb.) ; Germany (Strassb. Herb.) ; 

 Ohio (L:B.M.49) ; S. Carolina (B. M. """' 



6. C. citrinellum Lister. Plasmodium 1 Sporangia subglobose, 

 0-6 to 0'8 mm. diam., stipitate, erect, gregarious, rugose, lemon- 

 yellow or ocbraceous, tinged -with orange at the base ; sporangium- 

 wall of two layers, the outer cartilaginous, yellow, rugose from 

 dense innate areolated deposits of lime, easily separating from the 

 colourless membranous inner layer. Columella none. Stalk 

 cylindrical, 0'3 to 0-4 mm. high, stout, plicate, orange-red, 

 translucent. Capillitium a network of colourless hyaline threads, 

 with many large, irregular, and branching white lime-knots. 

 Spores purple-brown, rather strongly spinulose, 10 to 12 fj, diam. 

 — Biderma citrinum Peck, in Rep. N. York Mus. Nat. Hist., xxii., 

 p. 89 (1869). Physarwm dtrinellum'Peck, l.o., xxxi., p. 55 (1879); 

 Mass., Mon., p. 278. 



Plate XXVIII., B. — a. sporangia, x 20 ; J. capillitiiim and spores, x 

 280 ; 0. spore, x 600 (United States). 



Closely allied to CraUrium mutahile Fries, from which it differs in the 

 stouter structure of the sporangium-wall and in the larger, rougher 

 spores. The type specimen of Physarum lepidodermoides Blytt, Bidr. 

 Norg., Sop. iii., p. 4 (1892), from Rollag, Telemarken, on moss, has sub- 

 globose stipitate sporangia, 07 to 0"8 mm. diam. ; the sporangium-wall 

 breaks up into shining convex pale brown scales, densely charged with 

 deposits of lime ; there is no columella ; the stalks are 0'5 mm. high, 

 stout, broader at the base, pale yellow-brown, without lime-deposits ; the 

 capillitium consists of large irregular pale brown lime-knots connected 

 by branching hyaline threads ; the spores are purple-brown, spinulose, 

 9 to 11 /i diam. This appears to be represented by a single gathering, 

 and to have close affinity with C. citrinellum. 



Sab. On moss. — New York (L:B.M.50). Allied species ; Physarwm, 

 lepidodermoides, Norway (L:B.M.50). 



SPECIES NOT MET WITH IN THE QUOTED COLLECTIONS. 



7. C. porphyrium Schwein., in Trans. Am. Philos. Soc, Phil, 

 iv., p. 258 ; sporangia densely clustered, turbinate, purple-red, 

 glossy ; stalks very short, connate into a tiick basal mass ; spores 

 and the elastically expanding capillitium red. 



This description applies to Hemitrichia nibiformis List. 



SPECIES EXCLUDED FROM THE GENUS. 



G. rubigvnosum Mass. = Badhamia ruhiginosa Rost. 



G. dictyospermum Mass.=: Badhcmiia rubiginosa Rost. 



G. Gurtisii Mass. = Badhamia rubiginosa Rost. 



G. Ulaoinwm Mass. = Badhamia lilacina Rost, 



