Sturgis : Myxomycetes of Curtis Herbarium 201 
the remnants of the capillitium is easily explained, and the refer- 
ence of the specimen to P. compactum seems fully justified. 
Such being the case, however, it is evident that the name Physarum 
columbinum (Rost.) takes precedence of Physarum compactum 
(Wing.). 
“Didymium curtisii Berk. (1179) ad gram: & herb: viv: in 
Savannis. July, 1847. Society Hill, S. C.” 
As stated by Lister, this is typical Badhamiariibiginosa (Chev.) 
Rost. The dark, rather strongly spinulose spores measure lo-i 1.5 
fjL diam. 
“ Didymium dealbatum B. & C. Venezuela, coll. Fendler.” 
This specimen is undoubtedly a portion of the type of Chon- 
drioderma subdictyospennum Rost. It corresponds precisely with 
Rostafinski’s description. The earlier name was never published. 
“(3510) Didymium luteogriseum B. & C. Penna., 1851. 
Dr. Michener (484).” 
This specimen, together with another similarly labelled in 
Michener’s handwriting and bearing the same number (484) are 
apparently co-types, although the original note on the species 
(Grevillea, 2: 65, 1873) does not give the number of the speci- 
men referred to, nor does Rostafinski in referring to the same 
species later. The specimen labelled by Michener himself is in 
fine condition and is typical Physarum polycephalum Schw. It 
is interesting to note, however, that most of the sporangia in this 
specimen are single and therefore are of the so-called variety 
obrusseum.” 
“Didymium megalosporum B. & C. (1205) ad folia dejecta. 
June. Society Hill, S. C.” 
The specific name appears on the label as “ megalospermum” 
but Berkeley wrote '‘megalosporum.” The specimen is typical 
Didymium eximium Pk. Lister relegated this species to varietal 
rank under D. nigripes (Lk.) Fr., and applied to the variety the 
designation “ eximium.” This being the first name to be applied 
to the form after its transfer to varietal rank, it remains valid in 
accordance with Article 49 of the Vienna Rules of Nomenclature. 
If, however, Didymium eximium Pk. is regarded as a distinct 
