80 
BNDOSPOREiS;. 
[CHONDRIODERMA. 
from the membranous colourless inner wall. Columella convex or 
depressed, brownish ilesh-coloured, enclosing white lime-granules. 
Capillitium of delicate colourless or pale purplish threads, sparingly 
branched and anastomosing. Spores pale violet-brown, neaiiy 
smooth, Q to 8 /x diam. — Mass., Mon., p. 216. Didymium 
reticulatum E,ost.,in Fuckel, Symb. Myc, Nachtr. 2, p. 73 (1873). 
Ghondrioderma Saundersii Berk. & Br., in Mass., Mon., p. 209. 
Plate XXXI., A.—f. orbicular and plasmodiocarp sporangia, x 20 (United 
States). 
Rostafinski's type specimen at Strassburg consists of flattened, white, 
branching or net-like plasmodiocarps, with capilUtium and spores as 
described above. It is a question whether this species should not be 
placed as a variety of C. Michelii, from which it differs only in the 
shape of the sporangia. Instances have occurred in which the stalked 
and plasmodiocarp forms have been found together, with strong evidence 
that they sprung fi'om the same Plasmodium. On the other hand, they 
are so constant that, for convenience, the name given by Eostafinski is 
retained in this catalogue for the sessile and plasmodiocarp forms. 
From plasmodiocarp forms of C. testaceum it is distinguished by the 
flat sporangia and the absence of any rosy tinge in the sporangium- 
wall and columella. The Ceylon gatherings, marked " 75. Diderma 
dejjressum Fr." (B. M. 514 ; K. 1438, 1439), show flattened white plasmo- 
diocarps, with brownish flesh-coloured columella, and must be referred 
to C. reticulatum ; as also must G. Saundersii Berk. & Br., from Java 
(K. 1479), in the type specimen of which the broad, extensive 
plasmodiocarps resemble the American gatherings. 
ffab. On dead leaves, sticks, etc.— Luton, Beds. (L:B.M.67) ; Switzer- 
land (Strassb. Herb.) ; Ceylon (B. M. 514) ; Java (K. 1479) ; Ohio 
(L:B.M.57) ; Philadelphia (L:B.M.67) ; Iowa (B. M. 1022). 
7. C. niveuin Host., Mon., p. 170 (1875). Plasmodium? Spor- 
angia subglobose, depressed, sessile, crowded, 0*7 to r5 mm. diam., 
or forming scattered plasmodiocarps, sometimes seated on a white 
or dull yellow hypothallus, smooth, chalk-white; sporangium- 
wall of two layers, the outer densely charged with white lime- 
granules, separating from the inner layer, which is orange, 
membranous above, (cartilaginous below. Columella broad, convex, 
together with the base of the sporangium, orange, Capillitium 
of purple threads, sparingly branched except at the pale ex- 
tremities, rigid, sometimes intermixed with more delicate threads, 
more or less closely beset with, wart-like thickenings. Spores 
violet-brown, minutely spinulose, 9 to 11 /x diam. — Rost., Mon., 
App., p. 16; Cooke, Myx. Brit., p. 37; Blytt, Bidr. Norg., Sop. iii. 
(1892), p. 6. Diderma albescens Phill., in Grev., v., p. 114. 
Ghondrioderma albescens Mass., Mon., p. 209. Diderma deplana- 
tum Fr., Syst. Myc, iii., p. 110; Berk., in Engl. Fl., v., part ii., 
p. 312. Ghondrioderma dejjlanaiuvi Rost., Mon., App., p. 17 (in 
part) (1876). 
a. genuinum : sporangia subglobose, crowded. 
(3. deplanatum : sporangia forming plasmodiocarps, scattered. 
Plate XXXI. , B.—a. sporangia, x 20 ; b. capillitium and spores, x 280 ; 
c. spore, X 600 (Vosges Mts. ; Eostafinski's type) ; d. sporangia of form 
