294 THE MYXOMYCETES 



mainly a Pacific coast form. Also known from Chile and Venezuela. 

 Said to be common in Europe. Ceylon. 



4. Hemitrichia Rost. 

 Versuch 14. 1873. 

 1875. Hemiarcyria Rost., Mon. 261. 



Capillitium a tangled net of more or less branching and anastomosing 

 fibers centrally attached ; the sculpture regular, of conspicuous spirally 

 winding bands or ridges; habit and color various. 



The species here associated are intermediate between Arcyria and 

 Trichia, resembling the former in the capillitial net and the latter in 

 thread-sculpture. Fries applied the name Hemiarcyriece to a group of 

 trichias so-called, citing T. rubiformis as the first. In his " Versuch " 

 Rostafinski wrote Hemitrichia and afterward, in the Monograph, 

 Hemiarcyria. Massee combines the genera Arcyria and Hemiarcyria 

 under the former name. 



KEY TO THE SPECIES OF HEMITRICHIA 



a. Fructification plasmodiocarpous b 



a. Sporangia usually distinct, rarely somewhat plasmodiocarpous c 



b. Plasmodiocarps net-like, yellow; spores reticulated 1. H. serpula 



b. Plasmodiocarps shorter, brown; spores warted 2. H. karstenii 



c. Sporangia sessile or very short stalked d 



c. Sporangia with distinct, usually long stalks i 



d. Spores reticulated, over 14 /z 3. H. chrysospora 



d. Spores minutely warted or nearly smooth e 



e. Copper colored or reddish to deep brown ; spiral bands often 



faint or irregular 4. H. stipata 



e. Copper colored, fading to tawny yellow; bands distinct and 



regular 5. H. imperialis 



e. Without copper or red tints / 



/. Pallid or whitish 6. H. montana 



f. Yellow or ochraceous g 



g. Peridium hyaline, iridescent 7. H. ovata 



g. Peridium opaque h 



h. Minute, under 0.4 mm. diameter, usually sessile, some- 

 times plasmodiocarpous 8. H. minor 



h. Larger, usually with short, thick stipe 9. H. leiotricha 



i. Deep red 10. H. vesparium 



i. Pallid, yellow or yellow-brown j 



j. Stalk solid; capillitium distinctly spiny 11. H. intorta 



j. Stalk hollow, filled with spore-like cells; capillitium 



smooth or nearly so k 



k. Pallid or grayish ochraceous; spirals of capillitium sinistrorse 12. H.leiocarpa 

 k. Olivaceous yellow to bright yellow-brown; spirals of capil- 

 litium dextrorse / 



