156 A Monograph of the Myxogastre*. 



Arcyria aurantiaca, Raunk., Myx. Dan., p. 109, t. 3, figs. 4, 

 and 911. 



On rotten wood. Denmark. 



From the above description it is difficult to indicate either 

 the prominent features of the species intended, or its affinity 

 with other species. 



* * Spores warted. 



Arcyria similis, Hacib. 



Sporangia shortly stipitate, cherry-coloured ; threads of capil- 

 litium thick-walled, 4'2 5 8 /x broad, cylindrical or a little 

 compressed, everywhere with plate-elevations; plates generally in 

 the form of half-rings not arranged in a regular spiral manner, 

 but irregularly, or overlapping, or in spirals irregularly broken 

 up; spores 8.3 /A diameter, almost colourless, wall thin, dis- 

 tinctly verruculose. 



Arcyria similis, Racib., Myx. Crac., p. 13, f. 8; Sacc., Syll., 

 n. 1462. 



Poland. 



Arcyria Raciborsckii, Berlese. 



Sporangia stipitate, stem filled with cells; calyculus hemi- 

 spherical, membrane thin, reddish, densely covered on the inner 

 surface with very short, acuminate warts ; capillitium at the nodes 

 and often also on the intemodcs inflated into globose vesicles, 

 forming a loose net ; threads of lower portion of the capillitium 

 flattened, one margin with incrassated teeth, remainder of threads 

 smooth, the remainder and greater portion having the threads 

 sub-cylindrical, with the teeth arranged in a spiral, the remainder 

 of the thread with undulating ridges, in a varying number of 

 spirals, here and there becoming indistinct, or anastomosing to 

 form an irregular network on the surface of the thread ; spores 

 verruculose, 10'5 11*6 f* diameter. 



Arcyria Raciborsckii, Berlese, Sacc., Syll., vii., 1, n. 1467. 



