Sturgis: Myxomycetes of Curtis Herbarium 203 
reddish stalks 0.75 mm. in height ; membranous wall, venulose be- 
low ; and pale brownish spores, almost smooth, and measuring 
10-11.8/* diam. Miss Lister (Monog., Ed. 2, p. 65) notes the 
confusion caused by the existence of two species under the one 
number in Berkeley’s herbarium. The single specimen in the 
Curtis herbarium shows only Physarum pusillimi. 
“Didymium radiatum B. & C. ad fob gram. Cuba. C. 
Wright (733). B. & C. Fung: Cub: 529.” 
A quantity of the circular, whitish bases of stalks and two or 
three stalks filled with crystalline nodules of white lime are all 
that is left of this specimen. Miss Lister refers it to Didymium 
squamulosum (A. & S.) Fr. 
“Didymium ravenelii B. & C. Aest. 1852. Sulphur Springs, 
N. C. Ravenel (1513).” 
The few perfect sporangia show stout, brown or black stalks ; 
a capillitium of delicate threads with pale, reddish, fusiform lime- 
knots ; and pale violet-brown spores, very minutely spinulose and 
measuring 8.5-9. 5 diam. It is evidently a faded specimen of 
Physarum pulcherripes Pk. I have elsewhere discussed the rela- 
tionships and the synonomy of this species,^ but the conclusion 
therein stated that the specific name Ravenelii might be retained 
was a mistaken one, since the name given by Peck antedates the 
other by three months. That name was written ‘'pulcherripes,” 
and the original orthography should be retained. In connection 
with this species it is interesting to note the range of color exhib- 
ited in species of the “ P. globuliferum” group, including the red 
of “pulcherripes,” the brown of “ murinum,” the purple of “ pul- 
cherrimum.” I have recently seen specimens collected by Mr. 
Hugo Bilgram, of Philadelphia, which are of a pinkish lilac 
color, and Professor Macbride has collected a pale blue form. In 
all of these the distinctions are based practically on color alone. 
“Didymium tenerrimum B. & C. 533. “grayish.” fob Til- 
landsia etc. June 1857. Cuba. Coll. Wright (267).” 
This is a co-type of Physarum polycephalum Schw. var. obrus- 
seum (B. & C.) List. 
1 Transac. Conn. Acad. A. & S. Vol. X, Pt. 2, p. 468-470, 1900. 
