CHONDMODERMA.] 
PHYSARACEiE. 
79 
Cho7idrioderma Cichense Kost., Mon, App., p. 19. Ohondrioderma 
diforme Mass., Mon., p. 213 (in part). Diderma Marice-Wilsom 
Peck, in Rep. N. York Mus. Nat. Hist., xxvi., p. 74. 
Plate XXX., B.-a. Sporangia, x 20 ; J. capillitium, with fragment of 
sporangium-wall, and spores, x 280 ; c. spore, x 600 (Poland, Rostafinski s 
type). 
The type specimen of Diderma sublateritium Berk. & Br., trom 
Ceylon (K. 1454), is more rufous in colour than is usual in G. testaceum, 
though not so deep in tone as the specimen from S. Carolina 
(B. M. 520) ; the capillitium and spores are typical of this species, of 
■which it is clearly a form. 
ffab. On dead leaves.— Flit wick, Beds. (L:B.M.55) ; Moffat, Scot- 
land (L:B.M.55) ; France (B. M. 517) ; Germany (B.M. 516) ; Poland 
(Strassb. Herb.); Ceylon (L:B.M.55) ; New York (L:B.M.55) ; Ohio 
(L:B.M.55) ; S. Carolina (B. M. 520) ; Cuba (L:B.M.55). 
5. C. Michelii Post., in Fuckel, Symb. Myc, Nachtr. 2, p. 74 
(1873). Plasmodium opaque white. Sporangia flat, disc-shaped 
on a central stalk, rarely sessile on a broad base and confluent, 
chalk- white, 1 to 1-25 mm. wide ; sporangium-wall of two layers on 
the flat upper surface, the outer a fragile smooth crust composed 
of globular lime-granules 1 to 3 /x,diam., separating from the more 
persistent membranous inner layer ; under surface rugose. Stalk 
pale ochraceous, 0'5 mm. long, 0-25 mm. thick, furrowed with 
wrinkles, which are continued over the flat under side of the 
sporangium ; densely calcareous. Columella indefinite, consisting 
of the broad thickened base of the sporangium, flesh-red or 
flesh-brown, charged with calcareous deposits in the form of 
nodules and large rhomboidal granules. Capillitium of colourless 
delicate threads, variously branched and anastomosing, or of 
violet -brown threads 1 to 2 thick, sparingly branched except at 
the pale extremities. Spores pale violet -brown, almost smooth, 
7 to 9 fx diam.~Mon., p. 172, figs. 131, 146, 149, 150. Cooke, 
Myx. Brit., p. 37 ; Mass., Mon., p. 204. Didymium Michelii Lib., 
PI. Ardu. Exsic, Fasc. ii., No. 180. Physarum depressum Schum., 
Enum. PI. Saell., ii., p. 202 (1803). Diderma depressum Fr., Syst. 
Myc, iii., p. 108 (?). 
Plate XXXT., A. — a. sporangia, x 20 ; i. capillitium, with fragment of 
sporangium-wall and spores, x 280 ; c. capillitium, with stouter and more 
rigid threads, x 280 ; d. rhomboidal nodules of lime from stalk, x 280 ; 
e. spore, x 600 (England), 
Eah. On dead leaves, etc. Common. — Lyme Regis, Dorset 
(L:B.M.56) ; Batheaston, Somerset (B. M. 47) ; Boynton, Yorkshire 
(B. M. 1112); France (Paris Herb.); Belgium (B. M. 513); 
Germany (Strassb. Herb.) ; Sweden (K. 1449) ; Ceylon (K. 1440) : 
S. Carolina (B. M. 890) ; Pennsylvania (L:B.M.56). 
6. C. reticulatum Rost., Mon., p. 170 (1875). Plasmodium? 
Sporangia rounded, much depressed, sessile, gregainous, 0-7 mm. 
diam., or more usually elongated and forming flat branching or net- 
like plasmodiocarps, smooth, white ; sporangium-wall of two layers, 
the outer a fragile crust of globular lime-granules, separating 
