CHONDRIODERMA.] 
PHYSARACEiE. 
87 
granular, brown below, colourless above ; columella strongly de- 
veloped, following the windings of the plasmodiocarp, pale brown ; 
capilliti'um of slender lax colourless threads combined into a dense 
net ; spores nearly smooth 11-6 to 13-8/i diam. 
Hah. Kiew, Russia (Prof. Walza). 
The colour of the spores is not given by Eostafinski. Except tor 
the lai-ge size of the spores this description applies nearly to C. reticu- 
latum. 
18. C physaroides Eost., Mon., p. 170. Sporangia sessile, 
ii-regularly 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. C. deplanatum Eost., Mon., 
App., p. 17. 
Hal). The specimen described was gathered near Geneva by De 
CaudoUe (father and son). 
This description does not correspond with that of Diderma depla- 
natum Fr., which is given by Rostafinski 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 flesh-coloured ; capilli- 
tium well-developed, colourless, the threads combined into a net ; 
spores pale violet, smooth, 8 fx diam. Very nearly allied to 
G. Michelii. 
Hah. Muenchau, near Hattenheim (Fuckel). 
Sessile forms of C. Michelii agree with this description. 
20. C. calcareum Eost., 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 ; 
capillitivim abundant, of dull violet threads branched and forked, 
combined into a net; spores delicately warted, 9*2 to 11 "5 ^ 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 Didymium difforme with abundant dark capillitium. 
21. C. vaccinum 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 /u, diam. The outer sporangium-wall is 
