cribraria] heterodermaceae 177 



Switzerland (B.M. 2711) ; Portugal (B.M. 2710) ; New England 

 (B.M. 1425) ; Philadelphia (B.M. slide) ; Washington State (B.M. 

 2714) ; Colorado (B.M. 2715). 



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

 Plasmodium purple-black. Total height 2 to 4 mm. Sporangia 

 in large clusters, ellipsoid or subglobose, stalked, erect, 1 to 

 1-7 mm. high, 1 to 1-5 mm. broad, dull crimson; cup one- 

 third to half the height of the sporangium, ill-defined above, 

 marked with numerous oblique or longitudinal ribs, or with a 

 close reticulation of thickened bands, and studded with 

 plasmodic granules 1 to 1-5 \x diam. ; net of slender red-brown 

 rigid threads with a mesh about 0-1 mm. diam., without 

 conspicuous expansions at the nodes. Stalk rugged, dark 

 brown, 03 to 2 mm. long, 0*2 mm. thick. Spores rufous, 

 almost smooth, 5 to 6 fi diam. — Meylan in Bull. Soc. Vaud., 

 xliv. 294 (1908). 



PI. 139. — a. sporangia (Sweden) ; b. sporangium after dispersion of spores, from 

 a mounting in Canada Balsam ; c. part of net of sporangium-wall with margin of cup ; 

 d. e. spores. 



This handsome species is allied to C. macrocarpa, but differs in the 

 ruddy colour of the spores, and in the less expanded nodes of the 

 sporangial net. M. Meylan finds in the Jura mountains a form with 

 stalks two and even three millemetres long which he has published as 

 var. longipes (I.e.) ; he states that it only appears in the autumn months. 



Hab. On dead wood, etc. — Sweden (B.M. slide) ; Berne, Switzer- 

 land (B.M. 2716) ; Jura Mountains (B.M. 2717). 



3. C. rufa Host. Mon., p. 232 (1875). Plasmodium milk- 

 white. Total height 1-5 to 2 mm. Sporangia scattered, 

 stalked, subglobose or turbinate, erect, 06 to - 7 mm. diam., 

 bright orange-red ; cup one-third the height of the sporan- 

 gium, with a regularly toothed margin, more or less ribbed, 

 the thicker ribs continued into the wide-meshed net ; the 

 plasmodic granules of the sporangium-wall hardly 1 ^ diam. ; 

 nodes of the net not expanded, or narrow, triangular and 

 flattened, connected by three or four firm threads. Stalk 

 cylindrical, the length of the sporangium or more, 02 mm. 

 thick, longitudinally rugose, black. Spores pale yellowish- 

 red, minutely warted, 5 to 8 //, diam. — Mass. Mon., 63. Stemo- 

 nitis rufa Roth Fl. Germ., i. 548 (1788). Cribraria rufescens 

 Pers. in Roemer N. Mag. Bot., i. 91 (1794) ; Lister Mycetozoa, 

 140. C. intermedia Schrad. Nov. Gen. PI., 4 (1797). C. 

 fulva Schrad. I.e., 5. 



PI. 140. — a. sporangia (Scotland); b. net and cup of sporangium- wall ; c. spore 

 and plasmodic-granules. 



This well-marked species is remarkably constant in its characters ; 

 it appears to be most nearly allied to C. minutissima, from which it 

 differs in its much larger proportions. 



Hab. On dead coniferous wood. — Witley, Surrey (B.M. 2718) 

 Woburn Sands, Beds (B.M. 2719) ; Derbyshire (B.M. 2724) ; North 



