42 
ENDOSPORE/E. 
[PHYSARUil. 
spores, with rather few ovoid brown lime-knots, or a looser net- 
work of hyaline threads, with numerous elongated irregularly- 
branching lime-knots. Spores pale brownish- violet, nearly 
smooth, 8 to 10 /X, diam. — 1\ Braunianum List, in Journ. Bot. 
1891, p. 259 (non de Bary). 
Plate VII., B. — a. sporangia, x 20; h. plasmorliocarp, x 20; c. capillitiura 
and spores, x 280 ; d. spore, x 600 (United States). 
This species is closely allied to P. globuUferuiii, from which the 
stalked form scarcely differs except in the brown colour of the lime 
in the capillitium and sporangium-wall. The specimen from Moffat, 
described in Journ. Bot., 1891, under the name P. Braunianum de 
Bary, agrees with de Bary's description of that species in the usually 
sessile form and brown lime-knots of the capillitium, but as the type 
consists of only a single gathering by A. Braun near Berlin, and is not 
represented in the Strassburg or British collections, no proof of identity 
has been obtained ; the Moffat specimen is therefore placed under 
P. inurinum, the sessile American forms of which it closely resembles. 
Hab. On dead leaves, wood, etc. — Moffat (L:B.M.14) ; Philadelphia ; 
(L:B.M.14) ; Ohio (L:B.M.14). 
5. P. pulcherrimum Berk. & Rav., in Grev., ii., p. 65 (1873). 
Total height 1 mm. Sporangia globose, flattened beneath, 
stipitate, erect or inclined, pui-ple, 0"4 to 0'5 mm. diam., gre- 
garious. Sporangium-wall membranous, pale purple, with 
scattered clusters of large purple globular lime granules (1 /x, diam.) 
Stalk purple, subulate, brittle, containing lime. Columella small, 
convex, or none. Capillitium a close network of delicate purplish 
threads, broader and more expanded at the axils below ; lime- 
knots numerous, small, roundish, filled with pui'ple globular lime- 
granules. Spores pale dull red, almost smooth, 7 to 8 diam. 
— Rost. Mon., p. 105, fig. 84 ; Mass., Mon., p. 293. Physarum 
atrorubrum Peck, in Rep. New York Mus., xxxi., p. 40 ; Mass., 
Mon., p. 294. 
Plate VIII., A. — a. sporangia, x 20 ; h. capillitium with fragment of 
sporangium-wall and spores, x 280; c. spore, x 600, (United States). 
P. atrorubrum Peck is the same species (teste -Dr. G. A. Rex). 
Hab. On dead wood.— Ohio (L:B.M.15) ; Philadelphia (L:B.M.15) ; 
Iowa (B.M. 1013) ; S. Carolina (B. M. 412, 869). 
6. P. citrinum Schumacher, Enum. PI. Saell., ii., p. 201 (1803). 
Plasmodium ? Total height 0-8 to 2 mm. Sporangia globose, rugose, 
stipitate, rarely nearly sessile, erect, yellow to yellowish grey, 
0-4 to 0-7 mm. diam.; sporangium-wall membranous with innate 
clusters of yellow lime granules. Stalk golden yellow, opaque 
with dense deposits of lime, stout, somewhat furrowed, varying in 
length, chalky in section, often rising from a vein-like hypo- 
thallus. Columella short, conical, or obtuse. Capillitium a 
somewhat close network of hyaline rigid threads with flat ex- 
pansions at the axils, persistent after the dispersion of the 
spores ; lime-knots yellow, numerous, varying in shape and size, 
usually rounded, seldom developed at the axils of the branches. 
