CHONDRIODERMA.] PHYSARACE.E. 87 



granular, brown below, colourless above ; columella strongly de- 

 veloped, following the windings of the plasmodiocarp, pale brown ; 

 capillitium of slender lax colourless threads combined into a dense 

 net ; spores nearly smooth 11 '6 to 13'8 /x, diam. 



Hab. Kiew, Russia (Prof. Walza). 



The colour of the spores is not given by Rostafinski. Except for 

 the large size of the spores this description applies nearly to C. reticu- 

 latum. 



18. C physaroides Host., Mon., p. 170. Sporangia sessile, 

 irregularly rounded, 1 to 3 mm. diam., convex or somewhat 

 depressed, mutually compressed, chalk- white ; sporangium-wall 

 densely charged with lime; columella none, or inconspicuous, 

 depressed, dirty ochraceous ; capillitium inconspicuous, of delicate 

 slender hyaline threads combined into a net ; spores violaceous, 

 with scattered warts, 12'5 //, diam. C. deplanatum Host., Mon., 

 App., p. 17. 



Hab. The specimen described was gathered near Geneva by De 

 Candolle (father and son). 



This description does not correspond with that of Didcrma depla- 

 natum Fr., which is given by Rostafiuski as a synonym. 



19. C. Friesianum Host., Mon., p. 173. Sporangia sessile, 

 hemispherical, depressed, snow-white from the abundant deposits 

 of lime ; when the outer wall has fallen away, ash-grey ; columella 

 distinct, lenticular, depressed, yellowish or flesh-coloured ; capilli- 

 tium well-developed, colourless, the threads combined into a net ; 

 spores pale violet, smooth, 8 p diam. Very nearly allied to 

 C. Michelii. 



Hab. Muenchau, near Hattenheim (Fuckel). 



Sessile forms of C. Michelii agree with this description. 



20. C. calcareum Host., in Fuckel, Symb., Nachtr., p. 74 (1873). 

 Sporangia sessile, depressed, irregularly angled, forming vein-like 

 plasmodiocarps, chalk-white ; outer sporangium-wall shell-like, 

 brittle, easily falling away, the inner wall appearing violet-black 

 from the colour of the spores seen through its transparent 

 membrane ; columella inconspicuous, depressed, ochre-yellow ; 

 capillitium abundant, of dull violet threads branched and forked, 

 combined into a net ; spores delicately warted, 9*2 to 11 '5 /x, diam. 

 Mon., p. 179. 



Hab. Glacko (Link), Schendau (Schmidt), Fuckel. 

 There can be little doubt from the description that this species is a 

 form of Did >j in i tan cliff or me with abundant dark capillitium. 



21. C. vaccinum Host., Mon., p. 180, Sporangia sessile, globose, 

 depressed, the outer wall shell-like, leather-coloured; the inner 

 transparent, iridescent ; columella large, distinct, dusky ; capilli- 

 tium of delicate, colourless, simple threads ; spores dull brownish 

 violet, warted, 10'S to 11 '6 //. diam. The outer sporangium-wall is 



