148 A Monogra])h of the Myxogastres. 



to fig. 2, which no doubt is Arcyria cincrca, what also may be 

 seen by comparison of this figure with the authentic figure in 

 Bulliard's Hist, des champ., &c., Tab., 447, fig. 3. 



This error is to be found in all authors who have cited Tabula 

 1975 of Fl. Dan. I beg to observe that I follow the figure no. 

 I. of the Tabula and correct the text according to this, con- 

 sequently for A. cinerea I have cited Fl. Dan. Tab. 1795, fig. 2. 



Fig. 1 on the Tabula — fig. 2 in the text — Arcyria umhrina, 

 Schum., is hitherto quoted as synonymous with A. pomiformis, 

 Roth., but I think they are rather different both in their shape 

 and in their colour. 



On a rotten stump near Copenhagen I have found the above 

 described Aoryria, which throughout harmonizes with the figure 

 named and with Schumacher's description of his A. iimlrina. 

 This species I therefore believe to have again found. As may 

 be seen from the description, A. umhrina is in the thickenings 

 on the tubes of the cajDillitium very different from A. pomi- 

 formis, and more connected with A. inmicca. (Raunkier, in 

 Myx. Dan.) 



From the above it appears that Raunkier considers he has 

 collected the species intended by Schumacher. It Avill be 

 noted, however, that no type specimens are factors in the 

 determination, but only figures. 



Arcyria insignis, Kalchb. and Cke. 



Sporangia scattered, very minute, not more than -5 mm. high, 

 cylindric-ovate, rosy or vermilion, upper portion falling away, 

 calyculus minute ; stem half as long as sporangium, similarly 

 coloured, filled with large, globose, coloured cells which pass 

 into normal spores at the apex; capillitium dense, protruded 

 elastically, threads cylindrical, thick-walled, combined into an 

 irregular network ; everyiuhere densely and equally covered loith 

 stout, acute spines about 1 [x high ; spines not connected into a 

 network at the base; spores globose, smooth, 11 — 12 /x diameter. 



Arcyria insignis, Kalchbr. and Cke., Grev. x., p. 143; Sacc, 

 Syll., no. 1475. 



On rotten wood. S, Africa. 



