204 
Mycologia 
“6364 Didymium terrigenum B. & C. ad terram argillaceam 
nudam. Julio. 1857. Hillsborough, N. C.” 
This very scanty and weathered specimen consists of a mem- 
branous hypothallus on which, originally, were seated closely 
crowded sporangia, now reduced to the remains of a capillitium 
consisting of rounded or angular, pale yellow lime-knots, con- 
nected by abundant slender threads. The spores are violet- or 
umber-brown, almost smooth, and measure 7.5-8 /x diam. Lister 
appears to me to have been correct in referring this to Physartim 
' virescens Ditm. (Monog.,Ed. i,p. 60) rather than to P.lateritium 
as is done in Ed. 2 of the same work. 
“ Enteridium cinereum Schw. insuper putridas herbas effu- 
sum. Bethl. Herb. Schw. = ejus Lachnobolus.” 
“ Lachnobolus cinereus Schw. insuper stipites dejectos. 
Bethl. Herb. Schw. = ejus Enteridium.” 
Both of these specimens are typical Fnligo cinerea (Schw.) 
Morg. 
“ Spumaria licheniformis Schw. cort. trunc. dejec. Robiniae. 
Bethl. Herb. Schw.” 
This is typical Physarmn didermoides (Ach.) Rost. 
“ Physarum caespitosum Schw. Herb. Schw.” 
Many years ago I wrote in reference to this species : “ So far 
as I know, there is no authentic specimen in existence.”^ This 
specimen in the Curtis herbarium, however, must be considered 
as at least authentic. Unfortunately, practically nothing remains 
of it except traces of a thin, membranous, pale straw-colored 
hypothallus, and, mingled with these, numbers of spores of a pale 
umber color, very minutely and irregularly punctate and meas- 
uring 8-9.5 diam. These spores seem to me a sufficiently 
distinguishing feature so far as the connection of this species with 
Physarum citrinellum Pk., is concerned. They are certainly not 
the spores of the latter species. I can therefore only repeat, 
though with more assurance, my previous statement ( 1 . c.) that 
Physarum caespitosum Schw. is identical with P. virescens Ditm. 
There is nothing in Schweinitz’s original description which mili- 
zTransac. Conn. Acad. A. & S. Vol. X, Pt. 2, p. 472, 1900. 
