140 ENDOSPORE^E. [CRIBRARIA. 



cylindrical, 0*1 to 0'8 mm. high, furrowed, dark brown, arising 

 from a well-developed hypothallus. Spores or-hraceous, nearly 

 smooth, 5 to G /x diaru. Rost., Mon., p. 238; Cooke, Myx. Brit., 

 p. 59; Blytt, Bidr. K. Norg., Sop. iii., p. 10; Mass., Mon., p. G5. 

 Stemonitis argillacea Pers., in Grnel., Syst. Nat., ii., p. 1469 

 (1791). 



Plate LIL, A. a. sporangia, x 20 ; 1. net of sporangium-wall and stalk, 

 x 50 ; c. spores and plasmoclic granules, x 600 (England). 



This species varies much in the extent to which the net of the 

 sporangium-wall is developed. In the usual form the bands are dark 

 brown, well-defined, hardly expanded at the nodes, often stouter 

 towards the base ; but in some gatherings the thickenings are faint 

 and broad, and the wall of the sporangium is nearly uniform in texture, 

 in which case it closely resembles the form /3. simplex of Lindbladia 

 Tubulina. 



Hal. On dead wood. Richmond, Surrey (L:B.M.104) ; Birmingham 

 (L:B.M.104); Leighton, Beds (L:B.M.104) ; Boynton, Yorkshire 

 (B. M. 1044) ; Aboyne, Scotland (B. M. 243) ; Leicestershire 

 (B. M. 244A); Germany (Strassb. Herb.); Norway (L:B.M.104) ; 

 Philadelphia (L:B.M.104); Mass., U.S.A. (L:B.M.104). 



2. C. rubiginosa Fries, Syst. Myc., iii., p. 172 (1829). Plas- 

 moclium ? Total height 2 mm. Sporangia ellipsoid, shortly 

 stalked, crowded, erect, l - 7 mm. high. 1 mm. broad, crimson; cup 

 reaching to half the height of the sporangium, beset with minute 

 dark plasrnodic granules arranged in isolated clusters towards 

 the base of the membranous wall, and in a reticulated pattern 

 upwards, the lines becoming thickened and continued into the net 

 at the somewhat perforated margin ; net of delicate, dark brown, 

 rigid threads with a mesh about 1 mm. diam., without conspicuous 

 expansions at the nodes. Stalk rugged, dark brown, 0'3 to 

 0*5 mm. long, - 2 mm. thick. Spores rufous, almost smooth, 

 5 to 6 /x, diam. 



Plate LIL, B. a. sporangia, natural size ; b. sporangium after dispersion 

 of spores, from a mounting in Canada balsam, x 20 ; c. net of sporangium- 

 wall with margin of cup, x 180 ; d. spore, x 600 (Sweden). 



This handsome species appears to be represented by the solitary 

 Swedish gathering. 



Hob. On fir needles. Sweden (Edin. Herb. ; L:B.M.105 slide). 



3. C. rufescens Pers., in Romer, N. Mag. Bot., i., p. 91 (1794). 

 Plasmodium ? Total height 1-5 to 2 mm. Sporangia subglobose or 

 turbinate, scattered, stipitate, erect, 0-6 to 0'7 mm. diam., rufous- 

 brown; cup one-third the height of the sporangium, with a regularly 

 toothed margin, more or less ribbed, the thicker ribs continued 

 into the wide-meshed net ; the plasmoclic granules of the spo- 

 rangium-wall hardly 1 /x cliani. ; nodes of the net hardly expanded, 

 or narrow triangular, flattened, connected by three or four firm 

 threads. Stalk cylindrical, the length of the sporangium or more, 

 0'2 mm. thick, longitudinally rugose, black. Spores pale 



