44 
ENDOSPOllE^. 
[PHYSARUM. 
axils, lime-knots usually numerous, white, various in shap3 and 
size, mostly large and angled. Spores violet-brown, almost 
smooth, 7 to 10 /X diani. — Didymium melleum Berk. & Br., in Linn. 
Jour., xiv., p. 83 (1873). Physarum Schuniacheri, var. /? melleum 
Rost., Mon., App., p. 7. Didymium chrysopej)lum Berk, k 
Curt, in Grev., ii. (1873), p. 53. 
Plate IX., B.—a. sporangia, and one stalk showing a small columella, 
X 20 ; b. broken sporangia showing white capillitium, x 20 ; c. capillitium 
and fragment of sporangium- wall, x 280 ; d. spore, x 600 (United States). 
AUied to P. citrinum, but constant in its characters ;"of frequent 
occurrence in the United States. 
Hah. On dead wood, leaves, etc.— Cape (K. 57) ; Ceylon (B.M.4tl) • 
Borneo (K. 1257) ; Philadelphia (L:B.M. 18); Ohio rL:B.M.18) : 
Iowa (B.M. 1018) ; S. Carolina (B. M. 409, 853A). 
9. P. tenerim Rex, in Proc. Acad. Nat. Sc. Phil. 1890, p. 192. 
Plasmodium? Total height, 1 to 2 mm. Sporangia globose, 
stipitate, somewhat nodding, gregarious, yellow, 0-4 mm. diam. ; 
sporangium-wall membranous with closely-set rounded thin clusters 
of innate yellow granules. Stalk subulate, slender, opaque, 0*5 
to 1-7 mm. long, pale yellow and filled with lime above, darker 
below from the presence of refuse matter. Columella none. 
Capillitium of very delicate hyaline threads forming a regularly 
meshed network, often persistent after the dispersion of the 
spores, with numerous round or rounded yellow lime-knots, the 
branches slender at the axils and mostly free from lime. Spores 
violet-brown, nearly smooth, 7 to 8 /x, diam. 
Plate X., A. — a. sporangia, x 20 ; h. stalk and capillitium, x 170 ; 
c. capillitium and spores, x 280 ; d. spore, x 600 (United States). 
This species is closely allied to P. citrinum, differing in the more 
slender form, in the delicate flexuose capillitium threads connecting 
the lime-knots, and in the absence of a columella. Specimens sent by 
Dr. Haviland from Borneo are similar to the type of Dr. Rex. A. 
gathering from Mr. Morgan, Ohio, has small grey sporangia, 0"25 mm. 
diam., rugose, with deposits of white lime -granules in the sporangium- 
wall ; in other respects it is typical. 
Hab. On dead wood.— Borneo (L:B.M.19) ; New York (L:B.M.19) ; 
Ohio (L:B.M.19). 
10. P. compactum Lister. Plasmodium ? Total height 1 to 2 mm. 
Sporangia globose or somewhat flattened below, 0*5 mm. diam., 
stipitate, erect or nodding, spotted with pure white ; grey 
or bronze colour and iridescent between the rounded spots; 
sporangium -wall membranous, with numerous well defined 
rounded clusters of closely compacted lime granules. Stalk 
erect or flexuose, subulate, furrowed, 0*5 to 1*5 mm. long., 0-05 to 
0*13 thick at the base ; white and densely charged with lime 
above, brown or black below from the presence of refuse matter ; 
or white with chalky section to the base. Columella none, or 
represented by closely compacted lime-knots forming a globular 
cluster 0*1 mm. diam. at the apex of the stalk, but lying free in the 
