228 Mycetozoa of North America 



4. Trichia persimilis Karst. Not. Sallsk. Fauna et Fl. Fenn. 



Forh. 9:353. 1868. 



Plasmodium watery white (Lister). Sporangia globose, obo- 

 void, or clavate, usually crowded and seated on a common mem- 

 branous hypothallus, 0.5 to 0.8 mm. diam., brownish yellow or 

 golden yellow, shining; mass of capillitium and spores yellow; 

 sporangial wall membranous, yellow, marked with delicate, 

 stippled lines, or rows of minute warts. Capillitium of cylindrical 

 elaters 4-6 n diam., with about four closely set spiral bands 

 usually studded with numerous, short, slender spines; ends of the 

 elaters conical, acute, or with the spiral bands produced at the 

 ends into two or three diverging points; longitudinal striae in- 

 conspicuous. Spores yellow, 11-14 ^i diam., the reticulation 

 broken or represented by irregular, pitted warts; border inter- 

 rupted. 



Type locality: Europe. 



Habitat: On dead wood. 



Distribution: Common throughout North America. 



Illustration: Lister, Mycetozoa ed. 3. pi. 160, figs, a, b. 



In developments with typical or nearly typical spores, the 

 sporangia are usually smaller and more inclined to be globose or 

 irregularly so. As the spores approach T. affinis, the tendency is 

 to form larger and more clavate or obovoid sporangia. 



5. Trichia scabra Rost. Mon. 258. 1875. 



Oligonema fulvum Morg. Jour. Cin. Soc. Nat. Hist. 16: 36. 1893. 



Plasmodium watery white (Lister). Sporangia sessile, glo- 

 bose, usually crowded on a membranous hypothallus, 0.6 to 0.9 

 mm. diam., shining orange-yellow, olivaceous, or yellowish brown ; 

 sporangial wall membranous, yellow, marked with faint lines of 

 minute warts or fan-like tracery. Capillitium and spores bright 

 orange-yellow in mass. Elaters long, cylindrical, bright yellow, 

 4-6 /i diam., marked with four or five often somewhat irregular 

 spiral bands, studded with spines or nearly smooth, the ends 

 acutely conical, or with the bands produced at the ends in diverg- 

 ing points; longitudinal striae rarely evident. Spores yellow, 

 minutely and closely reticulate with low bands forming a complete 

 or fragmentary net with about forty meshes to the hemisphere, 

 rarely irregularly warted, 9-12 /x diam. 



