W. C. Sturgis — Type- Specimens of Myxomycetes. 475 



tical with those of G. glohosum, Rost., according to Lister's measure- 

 ments ; moreover, the capillitiura-threads in this specimen show here 

 and there fusiform expansions filled with Jirae-granules, a character 

 also seen in the capillitium of C. glohosiaa. The specimen is unques- 

 tionably an immature example of that species. A specimen of G. 

 sptnnarioides, Rost., collected by myself and authenticated by Mr, 

 Lister, shows the pinkish tinge seen in the specimen of G. globosum 

 received from Professor Peck, and has a dark capillitium, and fairly 

 dark spores measuring 9.3-1 1.2 p.. Still another has the pale capillitium 

 and spores of typical specimens, but the spores measure 8.2-1 1.2/a in 

 diameter. This is not the place to discuss these specimens in detail. 

 1 mention them merely to emphasize the fact that there can be no 

 sharp line drawn between G. globosum, Rost. and G. sjyumarioides, 

 Rost. As a rule, however, specimens showing, when mature, a 

 smooth outer wall, strongly developed hypothallus, capillitium with 

 occasional expansions containing lime, and dark, coarsely spinulose 

 spores measuring lO-Hyu, in diameter, may be placed under G. glo- 

 bosum, Rost.; the name G. spiimarloides, Rost. may be applied to 

 specimens showing, even when mature, a rugose, fragile outer wall, 

 thin and crust-like hypothallus, pale capillitium, and pale, minutely 

 spinulose spores measuring 8-1 0/a (Cf. PI. LX, figs, 12-13 & 14-15). 



To the former species G. crustacewn, Pk. unquestionably belongs, 

 if we accept Lister's conception of that species, I have given above 

 my reasons for so doing. 



DiDEKMA rARiNACEUM, Pk,, Rep. XX VI, p. 74, 1873, and Rep. 

 XXXI, p, 56, 1878, This is a perfectly normal specimen of Ghon- 

 drioderma spiimarioides, Rost,, and was so referred by Peck in the 

 second publication noted above, 



DiACH^A SPLENDENS, Pk., Rep. XXX, p, 50, PI, II, figs, 1-4, 1877. 

 This species has rightly been retained by both Lister and Macbride 

 and the descriptions given by both authors are so admirable that it 

 is unnecessary to add anything here. The type agrees perfectly 

 with the published descriptions and figures. The spore-surface, beset 

 with large, scattered, truncate tubercles which are occasionally con- 

 fluent in short bands, is sufticient to distinguish this species from the 

 globose form of DiachcBct elegans. Fr. (Cf. PI. LXI, figs, 21 & 22,) 

 These tubercles, when examined with a ^^ Homog, Im, lens, are seen 

 to be, not solid tubercles, but clusters of blunt, spinous processes, 

 the variability in the size of the seeming tubercles being due to the 

 greater or smaller number of spines composing the clusters. Occa- 

 sionally the spines occur singly, interspersed among the tubercles. 



