HEMITRICHIA 295 



/. Stalk expanding upward, gradually merging into the deep 

 caly cuius; capillitium loose, rough, with free ends usually 

 evident; spores coarsely papillate or subreticulate 13. H. clavata 



I. Stalk cylindrical, ending abruptly below the shallow 

 calyculus; capillitium dense, nearly smooth, with few or 

 no free ends; spores minutely spinulose or faintly reticu- 

 late 14. H. stipitata 



1. Hemitrichia serpula (Scop.) Rost. 



Versuch 14. 1873. 

 PI. XX, Figs. 524, 525, 526. 



1772. Mucor serpula Scop., Fl. Cam. ed. 2. 2 : 493. 



1786. Lycoperdon lumbricale Batsch, Elench. Fung. Cont. 1 : 259, fig. 174 a-c. 



1789. Trichia spongioides Vill., Fl. Dauph. 1061. 



1791. Stemonitis lumbricalis (Batsch) Gmel., Syst. Nat. 2 : 1470. 



1797. Trichia reticulata Pers., Tent. Disp. 10. 



1797. Trichia serpula (Scop.) Pers., Tent. Disp. 10. 



1803. Trichia venosa Schum., Enum. PI. Saell. 2 : 207. 



1842. Hyporhamma reticulatum (Pers.) Corda, Icones 5 : 13, pi. 2, fig. 34. 



1850. Trichia retiformis Payer, Bot. Crypt., fig. 574. 



1875. Hemiarcyria serpula (Scop.) Rost., Mon. 266. 

 1892. Arcyria serpula (Scop.) Mass., Mon. 164. 



Fructification plasmodiocarpous, often covering several square centi- 

 meters, terete, branching freely and usually everywhere reticulate, 

 rusty, tawny or bright yellow; peridium thin, transparent, with ir- 

 regular, longitudinal dehiscence; hypothallus like peridium or a little 

 darker, the margins between adjoining segments often separated by a 

 black line; capillitium variable, a tangle of long yellow threads, spar- 

 ingly branched, free everywhere except below, spinulose, the free 

 tips spinose, acuminate, spiral ridges three or four, with traces of 

 longitudinal strise; spore-mass golden yellow, spores beneath the lens 

 pale yellow, globose, coarsely reticulate, 11—16 /x. 



Very common, recognized by its bright yellow color and conspicuous 

 reticulate habit. The Plasmodium is at first milky white, becoming 

 yellow. Found on rotten logs of every description, on the lower 

 surface. 



Common west to the Rocky Mountains and Washington, south to 

 Mexico, Nicaragua, Colombia, Bolivia and Brazil. Also Europe, 

 South Africa, Manchuria, Japan and generally in the tropics. 



2. Hemitrichia karstenii (Rost.) List. 



Mycetozoa 178. 1894. 

 PI. XX, Figs. 543, 544. 



1876. Hemiarcyria karstenii Rost., Mon. App. 41. 



1889. Hemiarcyria paradoxa Massee, Jour. R. Micr. Soc. 356. 



