CHONDRIODERMA.] PHYSAEACE^. 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 /a diam. 



Hah. Kiew, Russia (Prof. Walza). 



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

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

 latum. 



18. C. physaroides Eost., 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 /a diam. G. deplanatum Eost., Mon., 

 App., p. 17. 



Hab. The specimen described was gathered near Geneva by De 

 CandoUe (father and son).. 



This description does not correspond with that of Diderma depla- 

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



19. C. Friesianum Eost., 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 ilesh-ooloured ; capilli- 

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

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

 C. Michelii. 



Hah. Muenohau, near Hattenheim (Fuckel). 



Sessile forms of C. Michelii agree with this description. 



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

 Sporangia sessUe, 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 ; 

 capniitium abundant, of dull violet threads branched and forked, 

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

 Mon., p. 179. 



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

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

 form of Didymium, difforme with abundant dark capillitium. 



21. C. vaeeinum Eost., 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, 10'8to 11 '6 /i diam. The outer sporangium-wall is 



