DIDYMIUM.] DIDYMIACE.E. 103 



stipitate ; stems mostly connate at the base, tapering upwards, 

 longitudinally wrinkled, white or cream-colour ; spores subglobose, 

 black, 10 fji diam. 



Hob. On decaying fungi. Portville, U.S.A. 



This brief description would apply to connate forms of either 

 Plnjsarum globuliferum or P. compression var. 8 ; but the shape of 

 the sporangia is against its being reduced to P. polymorphum, as is done 

 by Berlese (in Sacc. Syll., vii., p. 346). 



14. D. humile Hazslinszky in Oester. Bot. Zeitschr., xxvii., p. 84 

 (1877). Sporangia applanate, grey, pruinose, slightly umbilicate 

 above, deeply beneath ; stalk cylindrical, short, brown ; capilli- 

 tium brown, of smooth, simple, flexuose threads; spores brown, 

 6 to 7 p. 



Halt. Hungary. 



This description applies to D. farinaceum var. minus. 



15. D. platypus Hazslinszky, I.e., p. 83 (1877). Sporangia 

 greyish -white, pruinose, scattered, convex above, deeply umbilicate 

 beneath ; stalk cylindrical, dilated into a disc at the apex ; 

 columella none ; capillitium scanty, consisting of black threads 

 combined into a net ; spores blackish, smooth, 8 ^ diam. 



Hab. On rotten stalks. Hungary. 



16. D. affine Raunk., in Bot. Tidsskrift, xvii., p. 88, t. v., figs. 

 3 and 4. Sporangia spherical-hemispherical, stipitate. Stem 

 thin, of equal length or longer than the sporangium, expanded 

 into a circular hypothallus at the base, light brown ; wall grey 

 under the microscope, after the lime has fallen away colourless. 

 Columella globose or semi-globose, the colour of the stem, or lighter. 

 Threads of the capillitium nearly hyaline, expanded into numerous 

 shortly fusiform, brownish-violet swellings. Spores smooth or 

 delicately warted, 8 to 9 /a diam. 



Hab. On germinating seeds. Copenhagen. 



This description applies to pale brown stalked forms of D. effusum. 



17. D. longipes Mass., Hon., p. 236, fig. 226. Sporangia small, 

 globose, snow-white, frosted with a few scattered granules or 

 crystals of lime ; stem very long and slender, erect, snow-white, 

 very slightly attenuated upwards, almost smooth, expanding at 

 the base with a small circular white hypothallus ; columella 

 absent ; capillitium well developed, threads very thin, colourless, 

 branching and anastomosing irregularly to form, a network, nodes 

 usually triangular; spores globose, dingy lilac, smooth, 8 to 10 //, 

 diam. 



Hal. On bark and wood. Britain (Yorks) ; South Carolina. 



There is no specimen in Kew Herb, under this name as cited by 

 Mr. Masse e. 



