284 THE MYXOMYCETES 



The species is near to T. alpina Meyl. but differs so definitely that 

 it seems reasonable to consider it separate. The elaters are larger 

 than those of T. alpina and unlike those of any other Trichia. The 

 bands, core and tip of the elaters are distinctive. The simple peridium 

 is quite different from the distinctly double peridium of T. alpina. 



Oregon, Washington. 



6. Trichia macbridei M. Peck 



Am. Jour. Bot. 19 : 145. 1932. 



Sporangia closely gregarious or crowded on a strongly developed, 

 dark hypothallus, purplish brown to dark ochraceous, sessile, de- 

 pressed-globose, oval or forming short curved or annular plasmodio- 

 carps; peridium somewhat iridescent, thin, translucent but finely gran- 

 ular, breaking irregularly; capillitium and spore-mass ochraceous; 

 elaters very long to very short in the same sporangium, simple, 

 uneven, abruptly contracted to simple or bifurcate tips, marked 

 throughout with scattered blunt spines and warts, the spirals mostly 

 three to four, imperfectly developed, sometimes broken and replaced 

 for a distance with half-rings; spores finely and closely spinulose, 

 11-13 p. Plasmodium bright pink. 



The relationship is with T. contorta (Ditm.) Rost., a species already 

 sufficiently confused. The pink plasmodium, large sporangia, strongly 

 developed hypothallus and details of capillitial structure distinguish it. 



Oregon. Decaying logs of Populus trichocarpa. 



7. Trichia lutescens Lister 



Jour. Bot. 35 : 216. 1897. 



1892. Oligonema furcatum Buckn., in Massee, Mon. 173. 



1894. Trichia contorta (Ditmar) Rost., var. lutescens Lister, Mycetozoa 169. 



1908. Hemitrichia karstenii (Rost.) List. var. lutescens Torr., Bull. Soc. Port. 



Sc. Nat. 2 : 62. 

 1919. Hemitrichia obrussea Meylan, Bull. Soc. Vaud. Sc. Nat. 52 : 449. 



Sporangia sessile or rarely with short stalks, scattered or in small 

 clusters, globose or pulvinate, 0.15-0.7 mm. in diameter, shining bright 

 yellow or olivaceous; sporangium wall yellow, membranous, without 

 granular deposits, often marked with the impression of the contained 

 spores; capillitium of simple or branching elaters, of various lengths, 

 3-4.5 n in diameter, marked with four or five distinct or often faint 

 spiral bands, tapering or blunt and bulbous at the tips; spores bright 

 yellow or olivaceous, finely warted or spinulose, 10-12 yu. Plasmodium 

 watery pink. 



