470 W. C. Sturgis — Type- Specimens of Myxomycetes. 



and also the first which it received after its transfer to the genus 

 Physarion, and to call the species Physarum Ravenelii (B. & C), 

 Mass. This name is free from ambiguity, transgresses no accepted 

 rule of nomenclature, and is based upon the identity of type-speci- 

 mens. 



Physarum ornatum, Pk,, Rep. XXXI, p. 40, 1878. Of the type- 

 specimen of this species only the scantiest vestiges remain. They 

 consist of two or three sporangia in so immature a condition that 

 they show no characters of diagnostic value, and a number of short, 

 robust stalks, very dark brown in color and containing no lime. It 

 is impossible even to guess what species they represent. The 

 poorly-developed remains of the capillitium do not appear to be that 

 of Physarum auriscalphcm, Cke., to which Macbride refers the 

 species, and its general robust habit is unlike that of Physarum 

 viride, Pers., to which it is doubtfully referred by Lister. The 

 original description quoted by Lister (Mon. p. 63) throws little 

 light on the question. The species should be discarded. 



Physarum LUTEOLUM,Pk., Rep. XXX, p. 50, PI. II., figs. 15-18,1877. 

 The same general remarks apply to this species as to P. ornatum. 

 The type-specimen was originally scanty and the leaf of Cornus Can- 

 adensis upon which the sporangia were borne was evidently dried by 

 pressure, to the damage of the specimen. The persistent bases of 

 the sporangia alone remain, together with bits of the capillitium here 

 and there and a few spores. The sporangia were small (though 

 apparently larger than those of Physarum virescens, Ditm.), gregari- 

 ous but not clustered, and pale yellow in color. The remnants of the 

 capillitium are verj^ delicate, with lime-knots of medium size, angular 

 or rounded, and whitish or pale yellow in color. The spores are pale 

 violet-brown, very minutely spinulose, and measure 8.2-10.5/1. in 

 diameter. Neither Peck's description nor his figures are of much 

 assistance in determining the species. In habit, color and general 

 appearance the specimen resembled Physarum virescens, Ditm., var. 

 nitens, List., but the lime-knots are paler in color and smaller and 

 less branching than in that form, and the spores are decidedly larger. 

 It is useless under the circumstances to attempt to locate the species, 

 and therefore, in my opinion, the name should be discarded. 



Physarum citrinellum, Pk., Rep. XXXI, pp. 55 & 57, 1878. 

 This specimen is intei*esting as being the type of a species widely 

 distributed by Rex, although with no statement on the part of the 

 latter to the effect that he had even compared his specimens with the 

 type. Lister received it from Rex and based upon that specimen his 



