274 THE MYXOMYCETES 



1789. Trichia denudata (L.) VOL, PI. Dauph. 1060. 



1790. Trichia graniformis Hoffm., Veg. Crypt. 1 : 3. 



1791. Trichia cinnabaris Bull., Champ. 121. 



1791. Stemonitis crocea Gmel., Syst. Nat. 2 : 1467. 



1792. Trichia rufa Wither., Br. PI. ed. 2. 3 : 478. 



1794. Arcyria punicea Pers., Roem. N. Mag. Bot. 1 : 90. 

 1803. Arcyria conjugata Schum., Enum. PI. Saell. 2 : 215. 

 1876. Arcyria vernicosa Rost., Mon. App. 36. 



Sporangia crowded or gregarious, stalked, ovoid or short-cylindric, 

 tapering upward, 2-3 mm. tall, pompeian red * to brick-red * weather- 

 ing to various shades of reddish brown and brown ; peridium evanescent 

 except for the plicate calyculus; stipe about equal to the expanded 

 capillitium, concolorous, plicate or striate, ascending from a small 

 hypothallus; capillitium attached to the whole inner surface of the 

 calyculus and connate with it, hence not deciduous, bright red or 

 carmine when fresh, turning brown or paler with age, the threads 

 marked with a series of rather distant cogs or half-rings, which form 

 around them a lengthened spiral, the axis 3-4 /x in diameter; spore-mass 

 red or reddish brown; spores by transmitted light colorless, nearly 

 smooth, 6-8 ix. 



This species is easily distinguished from others of similar tints, 

 except A . insignis, by the attachment of the capillitium. In this respect 

 it corresponds with A. cinerea. In the adornment of the threads it is 

 like A . incarnata. It is by far the commonest species of the genus, and 

 probably enjoys a world-wide distribution. To be found at all seasons 

 on the lower side of fallen sticks. 



Micheli, pi. 94, shows that he had the present species. The descrip- 

 tion given by Linnaeus is worthless, but helped out by Micheli. Several 

 other authors of the eighteenth century, who take the trouble to de- 

 scribe the species, give the Linnsean binomial as a synonym. As a 

 matter of fact, Batsch first presents an unmistakable description and 

 figure under the name Embolus crocatus. 



Most likely to be confused with A . incarnata, from which it may be 

 distinguished by the attachment of the capillitium, the longer stipe 

 and the markings and size of the capillitial threads. 



Common throughout North and South America and Europe and 

 probably the world. 



3. Heterotrichia Massee 



Mon. 139. 1892. 



Sporangia distinct, stipitate; peridium simple, evanescent above as 

 in Arcyria; capillitium centrally attached, freely branched, the threads 

 within very slender, without broad, anastomosing to form a dense 



