46 
ENDOSPORE/E, 
[PHYSAEUM. 
and densely charged witli calcareous deposits. Stalk coarsely 
wrinkled, purple-brown. Columella none. Capillitium of delicate, 
branching, violet threads, mth numerous largo, angular, purple 
lime-knots. Spores dark purple-brown, rough with irregularly 
scattered warts 8-10 /x diam. 
Plate XVII., B.—a. stalked aud sessile sporangia, x 20 ; b. capillitium and 
spores, X 280 ; c. spore, x 600 (Colorado). 
The shape of the sporangia and the dark rough spores appear to 
be the only points which distinguish this species from Craterium 
rubescens Rex, with which it agrees in colour, in the character of the 
capillitium, and in the structure of the sporangium- wall. 
Hab. On sticks, on mountain, Colorado (B. M. 1014). 
13. P. psittacinum Ditm., in. Sturm, Deutsch. Fl., Pilze, 
p. 125, t. 62 (1817). Plasmodium or-ange, in the substance of 
rotten wood. Total height 1 mm. Sporangia globose or somewhat 
depressed, stipitate, gregarious, 0'5 to 0*8 mm. diam., purplish- 
blue mottled with red, iridescent ; sporangium-wall hyaline, deli- 
cately membranous, sprinkled with orange spots of thicker, more 
or less granular substance. Stalk equal, erect or curved, furrowed 
and rugose, vermilion or orange-red, intense clear orange in 
mountings in glycerine, without deposits of lime, rising from a 
well-developed hypothallus of the same colour, 0'5 to 0*7 mm. 
long, 0*1 mm. thick. Columella none. Capillitium a close 
network of flat, arching, colourless or yellowish threads, broad at 
the axils ; lime-knots numerous, varying in size, sharply angular, 
often branching, or confluent in the centre of the sporangium, 
bright orange, obscurely granular or translucent. Spores fuli- 
ginous-violet, smooth or nearly so, 7 to 8 /u, diam. — Rost., Mon., 
p. 104, figs. 75, 76; Lister in Journ. Bot. 1891, p. 257, PL 
308, fig. 1 ; Mass., Mon., p. 274. F. Carlylei Mass., Mon., p. 293. 
Plate XL, B. — a. sporangia, x 20 ; Zi. capillitium with fragment of spor- 
angium-wall showing crystalline discs, x 280 ; o. spore, x 600 (England). 
The specimens in the Kew collection named Dkhjmium erythrimim 
Berk, and D. Ravcnelii Berk. & Curt., given by Rostafinskias synonyms 
of P. 2)sittacinum, must be referred to P. pulchripes. The type speci- 
mens of P. psittacinum in the Strassburg collection are of the form 
described above. The type specimen of P. Carlylei Mass. (K. 68) is 
normal P . 2)sittadnum. In glycerine mountings, flattened disc-shaped 
crystalline bodies with radiating structure are usually seen imbedded 
in the sporangium-wall, as in P. virescens var. genuiiia. 
Hab. On dead wood.— Germany (B. M. 1109) ; Poland (Strassb. 
Herb.) ; New York (K. 12G6) ; Carlisle (K. 68) ; Lyme Regis, Dorset 
(L:B.M.-22). 
14. P. viride Pers.,in Usteri, Ann. Bot., xv., p. 6 (1795). Plas- 
modium yellow, in rotten wood. Total height 1 mm. Sporangia 
globose, lenticular, stipitate, nodding, 0-3 to 0-5 mm. diam., yellow, 
greenish, or orange; sporangium-wall membranous with innate 
dusters of yellow or orange lime-granules more or less closely 
disposed. Stalk subulate, slender, striate, gi-oy or straw-coloured, 
often darker below from enclosed refuse matter, without deposits 
