Sturgis : New or Rare Myxomycetes 



331 



or left-handed, the species has now been recorded from Maine, 

 Kansas, Pennsylvania, Poland and Scotland. 



Arcyria Oerstedtii Rost. A single large gathering of this 

 species was made in the Wet Mountain Valley, Colorado, in 

 August, 1 91 4. It is perfectly characteristic, though lacking the 

 persistent remnants of the sporangium-wall. This is not a diag- 

 nostic feature. The species is recorded from New York, Penn- 

 sylvania, and Kansas. The present record extends the range 

 westward, making it probable that it is not uncommon throughout 

 the United States. 



Arcyria occidentalis (Macbr.) List. This rare form was 

 found at Oquossoc, Maine, growing in company with Trichia 

 contorta on poplar bark, in May, 191 6. The gathering is faded 

 and weathered, indicating that the species should be looked for 

 early in the spring or possibly in the late autumn. The spo- 

 rangia are either separate or crowded ; in the former case they 

 show fairly long stalks. The persistent portion of the wall 

 splits downward in rounded lobes. The minutely spinulose capil- 

 litium is marked besides with a single row of small blunt teeth, 

 arranged in a very open spiral. Though rare, the species ap- 

 pears to be widely distributed. 



Perichaena corticalis (Batsch) Rost. var. liceoides (Rost.) 

 List. In looking over a collection of Myxomycetes made by 

 Professor Thaxter in Florida in 1897, I came across a peculiar 

 form growing on cow-dung, which, from its minute size, its 

 delicate, membranous structure, and the complete absence of 

 capillitium, I took to be an undescribed species of Licea. Speci- 

 mens were submitted to Miss Lister, however, who, in reply, re- 

 ferred the gathering as above, stating further that in a series of 

 specimens, all on dung, the capillitium was either absent, or in 

 the form of irregular elaters, or even combined into a net. In 

 the Florida specimens the sporangia are globose or pulvinate, 

 sessile, yellow-brown, 0.14-0.29 mm. in diameter; the wall is 

 pale-yellow, membranous, with minute granular thickenings ; 

 capillitium wanting; spores yellow, thick-walled, distinctly spinu- 

 lose, 11.5-13.5^ in diameter. This is the first recorded gather- 

 ing in America. 



Dianema Harveyi Rex. This species has hitherto been repre- 



