98 
ENDOSPOEE^. 
[didymium. 
The specimens K. 471 to 474, called D. jy^ysaroides, differ in no 
respect from the common, nearly sessile form of D. farhiacmm ; with 
a few exceptions the sporangia are confluent at their margins, but 
confluent sporangia are often met with in D. farinaceum. 
Eah. On dead leaves, bark, etc.— Highgate, London (B. M. 1068) ; 
a. and /3. Lyme Regis, Dorset (L:B.M.75) ; a. Ascot, Berks (B. M. 70) ; 
a. France (K. 6) ; a. Germany (B. M. 422) ; a. Maine, U.S.A. (K. 487) ; 
a. and /3. Ohio (L:B.M.75) ; a. S. Carolina (B. M. 889) ; 8. S. Carolina 
(B. M. 893). 
6. D. nigripes Fries, Syst. Myc, iii,, p. 119 (1829). Plas- 
modiiTm grey, among dead leaves. Total height 1 to 1 "5 mm. 
Sporangia hemispherical, umbilicate beneath, stipitate, erect, 
gregarious, 0'5 to 0"7 mm. diam., white; sporangium -wall mem- 
branous, mottled with brown, or colourless, beset with stellate 
crystals of lime. Stalk cylindrical, one to three times the height 
of the sporangium, longitiidinally striate, varying in colour from 
dark olive-brown to orange, hornclear. Columella subglobose, 
dark brown, orange, or white, filled with irregular angular 
granules of lime. Capillitium of delicate colourless or purplish- 
brown branching threads. Spores pale violet-brown, neai^ly 
smooth, 8 to 11 /X diam. — Berk., in Sm. Engl. El., Euiigi, p. 313. 
Physarum nigripes Link, in Berl. Mag., iii., p. 27 (1809); Ditm., 
in Sturm, Deutsch. El., iii., p. 35 (1816). P. microcarpon Er., 
Symb. Gast., p. 23. Didymium microcarpon E-ost., Mon., 
p. 157 (1875); Cooke, Myx. Brit., p. 32; Mass., Mon., p. 226 ; 
Macbride, in Bull. Nat. Hist. Iowa, ii., p. 146. Cionium xanthopits 
Ditm., I.e., p. 37. Didymium xanthopus Er., Syst. Myc, iii., 
p. 120. D. 2yertiosum Berk., I.e., p. 313 ; Cooke, Myx. Brit., p. 35 ; 
Mass., Mon., p. 241. D. pi'oximum Berk. & Curt., in Grev., ii., 
p. 52 ; Rost., Mon., App., p. 23 ; Macbride, in BuU. Nat. Hist. 
Iowa, ii., p. 145 ; Mass., Mon., p. 238. D. eximium Peck, in 
Rep. N. York Mus., xxxi., p. 41 ; Mass., Mon., p. 241. D. ful- 
vellum Mass., Mon., p. 237. D. elegantissimum Mass., Mon., p. 243. 
a. genuinum : stalk and columella dark olive-brown. 
yS. eximium : stalk dark orange, columella orange or buff. — 
D. eximium Peck, I.e. 
y. xanthopus : stalk orange, columella white. — D. xanthopus 
Er., I.e. 
Plate XXXIX., B. — a. small and large sporangia of a. genuinum, x 20; 
b. sporangium of y. xanthopus, x 20; o. sporangium of the same, broken 
and showing the white columella, x 20 ; d. capillitium and spores, with 
fragment of sporangium-wall, x 280 ; e. coarse capillitium (of less frequent 
occurrence), x 280 ; spore, x 600 (England), 
Rostafinski's specific name, which he adopted from Fries, was given 
by this author as a MS. synonym of his D. nirjripe.s in Symb. Gast., 
p. 23, and was never afterwards introduced into his works. Obviously 
Fries's name must be restored. 
The above varieties have been distinguished by specific names, 
depending on the colour of the stalk, columella, and capillitium. Tlie 
