78 ENDOSPORE.E. [CHONDRIODERMA. 



3. C. globosum Rost., Mon., p. 180, fig. 138 (1875). Plasmo- 

 dium white, among dead leaves. Sporangia globose, sessile, 

 crowded, O5 to - 8 mm. diam., seated on a strongly developed white 

 or cream-coloured hypothallus, smooth, white or cream-coloured ; 

 sporangium-wall of two layers, the outer composed of globular 

 lime-granules 1 to 2 //, diam., separating widely from the 

 membranous inner layer. Columella hemispherical or subglobose, 

 often minute, white or pale flesh-coloured. Capillitium of slender, 

 irregularly branched, and anastomosing pale purplish threads. 

 Spores dark purplish-brown, spinulose, 10 to 14 /x diam. Cooke, 

 Myx. Brit., p. 39 ; Mass.,, Mon., p. 206 ; Macbride, in Bull. Nat. 

 Hist. Iowa, ii., p. 147. Diderma globosum Pers., in Rom., N. Mag. 

 Bot., i., p. 89 (1794). Chondrioderma affine Rost., Mon., App., 

 p. 18 ; Mass., Mon., p. 210. C. simulans Rost., Mon., App., 

 p. 20 ; Mass., Mon., p. 209. Diderma crustaceum Peck, in Rep. 

 1ST. York Mus. Nat. Hist., xxvi., p. 74. Chondrioderma crus- 

 taceum Berlese, in Sacc., Syll., vol. vii., p. 373 ; Mass., Mon., 

 p. 215. 



Plate XXX., A. a. sporangia, x 20 ; &. capillitium, with fragment of 

 sporangium- wall and spores, x 280 ; c. spore, x 600 (Poland, Rostafinski's 

 type). 



The capillitium of this species often encloses particles of lime in 

 expansions towards the base of the threads. C. globosum is closely 

 allied to C. spumarioides, differing chiefly in the large and dark spores. 

 Rostafinski's type specimen of C. globosum from near Warsaw, in 

 Strassb. Herb., has dark spinulose spores 11 to 13 /z diam. ; his type 

 specimen of C. affine Rost. from near Warsaw is the same form. C. 

 simulans Rost. is described as differing chiefly from C. globosum in the 

 rough spores, 12 '5 ju diam. ; as the spores of the type specimen of 

 C. globosum correspond with this definition, C. simulans cannot be 

 considered a separate species. 



Hab. On dead leaves, etc. France (Paris) ; Strassburg (L:B.M.54) ; 

 Poland (Strassb. Herb.) ; Italy (B. M. 525) ; Iowa (B. M. 816). 



4. C. testaceum Rost., Versuch, p. 13(1873). Plasmodium ? 

 Sporangia sessile, subglobose, depressed on a broad base, some- 

 times confluent, O'S mm. diam., smooth, dull flesh-coloured or 

 pale pinkish, often becoming bleached ; sporangium-wall of two 

 layers, the outer thin, brittle, egg-shell-like, composed of globular 

 lime-granules, separating freely from the more persistent, pinkish- 

 grey, membranous inner layer. Columella large, convex or 

 hemispherical, together with the base of the sporangium flesh- 

 coloured or reddish-brown. Capillitium of delicate, faintly 

 purplish, branching flexuose threads. Spores pale violet-brown, 

 almost smooth, 7 to 8 p, diam. Rost., Mon., p. 179, figs. 135, 136 ; 

 Mass., Mon., p/210; Macbride, in Bull. Nat. Hist. Iowa, ii., p. 148. 

 Didymium testaceum Schrad., Nov. PI. Gen., p. 25 (1797). 

 Diderma testaceum Pers., Syn., p. 167. Diderma sublateritium 

 Berk. & Br., in Journ. Linn., xiv., p. 82. Chondrioderma sub- 

 lateritium Rost., Mon., App., p. 19 ; Mass., Mon., p. 211. 

 Diderma Cubense Berk. & Curt., in Journ. Linn., x., p. 347. 



