298 THE MYXOMYCETES 



6. Hemitrichia Montana (Morgan) Macbr. 



N. A. Slime-Moulds 208. 1899. 

 PI. XX, Figs. 541, 542. 



1895. Hemiarcyria montana Morg., Jour. Cin. Soc. Nat. Hist. 18 : 40. 



Sporangia scattered or more or less closely gregarious, globose, 

 whitish, sessile or very short-stipitate; peridium opaque, dull white, 

 persistent below; capillitium deep yellow, the threads abundantly 

 branched, forming a compact network, 7 /x wide, spirals five or six, 

 uneven and irregular, or anon interrupted, conspicuously spinulose 

 or warted, free tips not lacking, generally inflated; spore-mass yellow; 

 spores by transmitted light pale, nearly colorless, distinctly warted, 

 10-12 fi. 



Recognizable by its peculiar pallid, sessile sporangia, as by the 

 internal structure. Miss Lister includes this species in H. clavata. 



Common throughout the southwestern states to southern Cali- 

 fornia. 



7. Hemitrichia ovata (Pers.) Macbr. 



N. A. Slime-Moulds ed. 2. 261. 1922. 

 PI. XX, Figs. 530, 531, 532. 



1796. Trichia ovata Pers., Obs. Myc. 1 : 61. 



1863. Trichia abietina Wigand, Prings. Jahrb. 3 : 33, pi. 2, fig. 11. 



1875. Hemiarcyria wigandii Rost., Mon. 267. 



1892. Arcyria wigandii (Rost.) Massee, Mon. 163. 



1911. Hemitrichia abietina (Wigand) Lister, Mycetozoa ed. 2. 227. 



Sporangia crowded or sometimes closely gregarious, subglobose or 

 turbinate, about 0.5 mm. in diameter, shining yellow, sessile; peridium 

 thin, iridescent; capillitium a tangle of sparingly branched yellow or 

 ochraceous yellow threads, rather slender, 3-5 /*, marked by one or 

 two prominent spiral bands forming a loose, somewhat irregular spiral, 

 the free ends not infrequent, inflated and rounded; spore-mass yellow 

 or yellow ochraceous; spores by transmitted light pale yellow, distinctly 

 and sharply spinulose, but not netted, 10-1 1 fx. 



A rare and beautiful species, distinguished well by the small size, 

 the thin iridescent peridium, and the microscopic characters of the 

 capillitial threads. 



There is no doubt that this is Persoon's Trichia ovata. His descrip- 

 tion is accurate in all that pertains to external features, and Rostafinski 

 (Mon. App. 41) explicitly says that he saw in Persoon's herbarium 

 specimens of the species bearing the name cited. Just why Rostafinski 

 did not here adopt the older name is not clear, nor is there excuse for 



