240 A Monograph of the Myxogastres. 



to form a dense net, with the angles usually triangular ; spores 

 dingy purple, globose, loartcd, 12 — 14 ^ diameter. 



(Type in Herb. Berk., Kew., with Tibnadodie nutans.) 



On bark. Ceylon. 



Scattered, 1'5 — 2 mm. high. Bearing a superficial resem- 

 blance to Tilmadoche nutans, but distinct in the capillitium, 

 which contains no trace of lime, and in tlie spores. 



Didymium zeylanicum, B. and Br. 



Sporangium hemispherico-depressed, with a shallow umbilicus 

 below, wall thin, colourless, frosted with white granules of lime ; 

 stem elongated, attenuated v^nvards, or almost obsolete, brovn 

 or yellow, longitudinally wrinkled, filled with small grains of 

 lime, expanding below into a spreading hypothallus ; capillitium 

 forming a dense irregular net, threads colourless, very thin ; 

 spores dark purple, globose, very minutely verruculosc, 7 — 9 ju 

 diameter. 



Didymium zeylanicum, B. and Br., in Journ, Linn. Soc, vol. 

 xiv., p. 84. 



Chondrioderma zeylanicum, Bost., Mon. App., p. 15 ; Sacc, 

 SylL, no. 1254. 



Chortdrioderma. exiguwm, Racib., Hedw., 1889, p. 118. 

 (Type in Herb. Berk., no. 10770.) 



On decayed Avood. Ceylon ; Poland. 



The species described as Clwndrioderma cxiguum cannot be 

 separated from the present species; the points of difference 

 given by Raciborski only apply to certain individuals which, 

 from an examination of the type, is a variable species. 



Didymmm obrusseum, B. and C. 



Sporangium white or pale yellow, almost globose, sometimes 

 slightly umbilicate below, wall very thin, ivith little or no lime, 

 often iridescent when empty ; stem attenuated ujnvards, fattened 

 and distorted helow, weak and droojnng, hrigJif yelloio, expanding 

 at the base into a very thin, irregular hypothallus of the same 

 colour ; columella absent ; capillitium rather scanty, threads 



