84 ENDOSPORE^. [CHONDRIODERMA. 



p. 200. Lycoperdon radiatum Linn., Sp. PI., ed. 2, p. 1654 (1763). 

 Biderma umhilicatum Pers., Syn., p. 165; Engl. PL, v., p. 310. 

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

 stellare Link, in Berlin Ges. Nat. Fr. Mag., iii., p. 26 ; Rost., in 

 Fuckel, Symb. Myc, Nachtr. 2, p. 72. Biderma Carmichedianum 

 Berk., Engl. PL, v., p. 311. Chondrioderma Garniichcelianum 

 Cooke, Myx. Brit., p. 42 ; Mass., Mon., p. 202 (in part). 



Plate XXXIII., B. — a. sporangia, x 20; J. capillitium and spores, x 

 •280 ; c. spore, x 600 (England). 



The development of lime varies in different gatherings and often in 

 individuals of the same cluster ; instead of the wall being obscurely 

 granular, as is usually the case, it may be loaded with white granules, 

 or these may be partially present, forming a white cap to a dark 

 sporangium, or the sporangia may be dark brown with little or no 

 deposit of lime in the wall. American specimens received from 

 Dr. Bex differ from the European in the colourless flexuose capillitium 

 and the more ovoid columella. C. roanense is describedas a new species 

 by Dr. Rex (Proc. Acad. N. So. Phil., 1893, p. 368) ; the sporangia 

 are umber-brown, resembling in this respect the dark .forms of 

 C. radiatum occasionally met with at Lyme Regis, but they are much 

 depressed and almost orbicular in shape ; the columella is convex and 

 pale ochraceous ; the short stalks are black ; the capillitium is colour- 

 less, of the same character as in the American specimens of G. radiatum ; 

 the spores are similar to those of the latter species. It appears to be 

 represented by a single gathering from Roan Mountain, Tennessee, 

 and is allied to C. radiatum, as pointed out by Dr. Bex, who adds : 

 " It differs from the other discoidal or orbicular species in the dark 

 chestnut umber colour, its well-marked discoidal columella and jet- 

 black irregular stipe.*' Until further gatherings are obtained to esta- 

 blish the constancy of the form, C. roanense may be regarded as a variety 

 of C. radiatum. 



Sab. On bark, twigs, etc. — Lyme Regis, Dorset (L:B.M.62) ; 

 Boynton, Yorkshire (B. M. 1063) ; Poland (Strassb. Herb.) ; Norway 

 (B. M. 531) ; Italy (B. M. 532) ; Virginia (L:B.M.62). 



12. C. nigosum Rex, in Proc. Acad. N. Sc. Phil. 1893, p. 369. 

 Plasmodium grey. Total height 0-7 to 1 mm. Sporangia subglobose 

 or hemispherical, stipitate, scattered, 0'5 to 0'6 mm. diam., 

 greyish-white, brown at the base, reticulated vnth wrinkles " which 

 divide the -W^all into 25 to 30 irregularly polyhedral portions " ; 

 sporangium-wall single, papyraceous, with scanty deposits of lime 

 in minute, scattered, angular fragments. Stalk subulate, 0"4 to 

 0'6 mm. high, furrowed, black. Columella clavate, about half the 

 height of the sporangium, rugose, chalky or yellowish-white. 

 Capillitium of delicate colourless threads, sparingly anastomosing 

 and branching towards the tips. Spores violet-brown, minutely 

 warted, 9 /j, diam. 



Plate XXXIV,, A. — a. sporangia, x 20 ; i. capillitium, with fragment of 

 sporangium-wall and spores, x 280 ; c. spore, x 600 (United States). 



This species is, as stated by Dr. Rex, allied to C. radiatum ; it has 

 been found once in considerable abundance at Cranberry, N. Carolina. 



Sab. On moss, etc.— N. Carolina (L:B.M.63), 



