150 A Morwgrcrph of the Myxogastres. 



a dense, irregular network, protruded elastically ; threads cqiudly 

 covered in every part %vith short, variously curved, and frequently 

 anastomosing, slightly raised hinds; sometimes a more or less 

 perfect ring occurs; spores globose, smooth, 8 — 10 /x diameter. 



Arcyria versicolor, Phillips, in herb. 



Arcyria versicolor, Phill., Grev., v., p. 115, t. 88, f. 8, a — e; 

 Sacc, Syll., vii., 1, n. 1473. 



Arcyria vitellina, Phill,, Grev., v., p. llo, t. 88, f. 7, a — e; 

 Sacc, Syll, n. 1474. 



On tiunks. California. 



A beautiful species, 3 — 3'5 mm. high. Variable in colour, 

 but constant in all important characters. I am indebted to 

 Mr. Phillips for an oj^portuuity of examining the type specimens. 



Arcyria nutans, Rost. (figs. 140, 141). 



Sporangia cylindrical, sometimes ovate, very shoiily stipitate, 

 wall dingy yellow ; stem same colour, filled with large cells ; 

 capillitium and mass of spores pale opaque yellow; eapillitium 

 elastically protruded, elongated, drooping, threads combined to 

 form a dense, irregular network, thickenings in the form of 

 prominent half-rings, often with projecting spines arranged .in 

 a diffuse spiral, the remainder covered loith a fine, irregular net- 

 woQ'h ; spores globose, pale yellow, smooth, 7 — 8 fx diameter. 



Arcyria nutans, Rost., Mon., p. 277 ; Cke., Myx. Brit., p. 72. 



Exsice. — Fuckel, Fung. Rhen., n, 1439. 



On rotten wood and bark. Britain (Kew, Scarboro', Carlisle) ; 

 Europe ; United States. 



Scattered or gregarious, 1'5 — 2 mm. high. Somewhat re- 

 sembling A. cinerea, but distinguished by the short stem, the 

 elastically protruded, very long, drooping capillitium, which is 

 usually the colour of ground ginger, but sometimes tinged with 

 brown, and more especially by the portion of the capillitiam 

 threads not occupied by the half-rings being ornamented with 

 a fine network of slightly raised lines. 



