PHYSARUM.] 
PHYSARACE.E. 
57 
Berkeley's description of Didymium scrohiculatum, that Rostafinski 
was right in placing it under P. cinereum. There is nothing remaining 
of the type specimen in Berkeley's Herb. (K. 1518). 
Hub. On dead leaves, etc.— Lyme Regis, Dorset (L:B.M.32) ; 
Leytonstone, Essex (L:B.M.32) ; France (Paris Herb.) ; Germany 
(Strassb. Herb.) ; Natal (K. 2) ; Ceylon (K. 1284) ; Madras (K. 17) ; 
Pennsylvania (L:B.M.32) ; Iowa (L:B.M.82) ; S. CaroHna (B. M. 428, 
431, 885, 934) ; Cuba (B. M. 429) ; Paraguay (K. 562). 
24. P. bivalve Pevs., in Usteri, Ann. Bot., xv., p. 5 (1795). 
Plasmodium white, among dead leaves. Sporangia sessile, elon- 
gated, laterally compressed, sinuous or branched, equal in breadth 
from the base to the flattened ridge, which at length splits longi- 
tudinally ; sometimes pulvinate, bursting irregularly ; white, grey, 
01' yellowish ; sporangium-wall double, the outer layer with, copious 
deposits of lime, smooth or reticulated, the inner wrinkled and 
coloiu-less, showing as a grey membrane along the line of dehiscence, 
adhering to the outer layer below. Columella none. Capillitium 
a network formed of numerous white, often branching lime-knots, 
varying in shape and. size, connected by rather short hyaline 
threads. Spores violet-brown, spinulose, 8 to 10 diam. — Keticu- 
laria sinuosa Bull., Champ., p. 94, PI. ccccxlvi., fig. 3 (1791). 
Angim-idium sinuosum G-rev., Scot. Crypt. FL, t. 310. Diderma 
valvatum Fr., Syst. Myc, iii., p. 109. Physarum sinuosum Fr., 
Syst. Myc, iii., p. 145 ; E,ost., Mon., p. 112, fig. 91 ; Cooke, Myx. 
Brit., p. 14 ; Mass., Mon., p. 305 ; Macbride, in Bull. Nat. Hist. 
Iowa, ii., p. 157. 
Plate XIX., B. — a. sporangium, x 20 ; J. capillitium with fragment of 
pporangiuin-wall and spores, x 280 ; c. spore, x 600 (England). 
Forms without lime occur occasionally in P. bivalve and the allied 
species. 
Hab. On dead leaves, etc.— Portbury, near Bristol (B. M. 116, 117) ; 
Leytonstone, Essex (L:B.M.33) ; Luton, Beds. (L:B.M.33); France 
(K. 28) ; Germany (B. M. 510) ; Finland (B. M. 450) ; Bohemia 
(B. M. 446) ; Poland (Strassb. Herb.) ; Italy (K. 1345) ; Ceylon 
(B. M. 451) ; Java (K. 1312) ; Brisbane (B. M. 535) ; Iowa (B. M. 
811) ; S. Carolina (B. M. 932, 933, 934). 
25. P. Diderma Ptost., Mon., p. 110 (1875). Plasmodiiim white. 
Sporangia subglobose, 0-6 to 0-8 mm. diam., sessile; or curved and 
flexuose plasmodiocarps 2 to 6 mm. long, rounded, not compressed, 
smooth, white or bulF; sporangium-wall double, the outer Avail 
densely charged with white lime-granules, free and deciduous 
above, recurved and persistent below ; inner wall smooth, mem- 
branous, persistent, of two layers, the outer thin and colourless, 
combined with the purplish inner layer. Columella none. Capil- 
litium a network of hyaline threads, with numerous, variously 
shaped large white lime-knots. Spores dark purplish-brown, 
spinulo.se, 10 to 12 fx diam.— Mass., Mon., p. 304 : List., in Journ' 
Bot. 1891, p. 260, PI. 309, fig. 2. 
Plate XXI r., A.— a. sporangia, x 20 ; h. (•apillitium with fragment of 
sporangium and spores, x 280 ; o. spore, x GOU (Jingland). 
