244 Mycetozoa of North America 



sporangial wall membranous or cartilaginous, thickened with de- 

 posits of granular matter. Capillitium a loose network of branch- 

 ing, yellowish or reddish brown threads 3-5 fx diam., marked with 

 three to five more or less distinct sinistral, spiral bands, rarely 

 smooth, often with scattered ring-shaped thickenings and irregu- 

 lar expansions; free ends pointed or blunt. Spores yellow, min- 

 utely warted, 10-14 n diam. 



Type locality: Finland. 



Habitat: On dead wood. 



Distribution: Colorado, *Montana, *Ontario, *Washington. 



Illustration: Lister, Mycetozoa ed. 3. pi. 171. 



This form is practically the same as Trichia contorta, showing 

 similar variations, but with the threads of the capillitium com- 

 bined into a network. Similar forms are found occasionally in 

 other species of the genus Trichia. The present form, like Calo- 

 nema aureuni, is retained for convenience, as it has been reported 

 frequently from Europe, although rarely from North America. 



7. Hemitrichia Serpula (Scop.) Rost. Versuch 14. 1873. 

 Mucor Serpula Scop. FL Carn. ed. 2. 2: 493. 1772. 



Plasmodium milky white, then yellow (Macbr. & Martin). 

 Sporangia forming elongate, winding, branched plasmodiocarps, 

 0.4 to 0.6 mm. wide, usually uniting into a close net, golden yellow 

 or brownish yellow, often seated on a reddish brown hypothallus; 

 sporangial wall of two layers, the outer membranous or cartilagi- 

 nous, yellow, or brownish yellow from deposits of refuse matter, 

 the inner membranous, delicately marked with a network re- 

 sembling fan-tracery. Capillitium an elastic tangle of twisted, 

 sparingly branched, yellow or orange threads 5-6 ju diam., marked 

 with three or four, rarely more, regular, sinistral, spiral bands, 

 usually spinose, rarely smooth; longitudinal striae often distinct; 

 free ends pointed. Spores yellow, reticulate with narrow bands 

 forming a net with from nine to twelve meshes to the hemisphere, 

 10-12 n diam.; border 0.5-1 /x wide. (Plate 14, fig. 2.) 



Type locality : Austria. 



Habitat: On dead wood. 



Distribution: Common throughout North America. 



Illustration: Lister, Mycetozoa ed. 3. pi. 170, figs. a-c. 

 This conspicuous, common, abundant species needs no comment. 



