78 ENDOSPORE*. [CHONDRIODERMA. 



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

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

 crowded, 0-5 to 0-8 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 /* diam. — Cooke, 

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

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

 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. Biderma crustaoeum Peck, in Rep. 

 N". 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 ; 6. capillitiuia, with fragment of 

 sporangium-wall and spores, x 280 ; e. spore, x 600 (Poland, Kostafinski'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 i^ 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 ji. diam. ; as the spores of the type specimen of 

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

 considered a separate species. 



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

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



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

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

 times confluent, 0'8 mm. diam., smooth, dull flesh-coloured or 

 pale pinkish, often becoming bleached; sporangium- waU 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 /j, diam. — Rost., Mon., p. 179, figs. 135, 136 ; 

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

 Didymium testaeeum, Schrad., Nov. PL Gen., p. 25 (1797). 

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

 Berk. & Br., in Journ. Linn., xiv., p. 82. Chond/rioderma sub- 

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

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



