190 Mycetozoa of North America 



0.6 to 1 mm. diam., yellowish brown; cup brown with numerous 

 dark brown longitudinal ribs, and a broad connective zone to the 

 net, which has numerous perforations, and toothed and irregular 

 where it merges into the net; nodes flattened, elongate, confluent 

 and irregular in the lower part, branching and polygonal above; 

 dark plasmodic granules in the ribs and nodes, 1-2 /j. diam. Stalk 

 0.8 to 1 mm. high, thick, furrowed, dark brown. Spores ochra- 

 ceous, nearly smooth, 4-6 /x diam. 



Type locality: Europe. 



Habitat: On dead coniferous wood. 



Distribution: Michigan, New Hampshire, New York, North 

 Carolina, Ontario, Oregon, Pennsylvania, Quebec, *South Caro- 

 lina, *Washington. 



Illustration: Lister, Mycetozoa ed. 3. pi. 141, figs. a-d. 



This species is rare in North America, and collections are con- 

 fined to mountainous regions at high altitudes. Forms inter- 

 mediate with C. intricata are often found when the latter species 

 is fruiting in abundance, sometimes mixed in the same develop- 

 ment. These are usually paler in color, the connective zone is not 

 so broad, and the nodes are thickened. They are nearer C. intri- 

 cata, though approaching C. macrocarpa. The characteristic 

 features of C. macrocarpa are the large, dark sporangia ; the dark 

 ribs of the cup; the broad zone between the cup and net, with its 

 perforations; and the flattened, irregular nodes. 



3. Cribraria piriformis Schrad. Nov. Gen. PI. 4. 1797. 



Cribraria atrofusca Martin & Lovejoy; Martin, Jour. Wash. Acad. Sc. 22: 92. 

 1932. (N. Y. B. G. no. 7122, cotype material.) 



Plasmodium pale slate-color? (Lister). Total height 1 to 1.7 

 mm. Sporangia gregarious, turbinate or globose, stalked, 0.4 to 

 0.9 mm. diam.; spore-mass yellowish brown; cup brown, about 

 one third the height of the sporangium, irregularly toothed and 

 somewhat perforated at the margin, or equally toothed, studded 

 with large, dark, round plasmodic granules 2-2.5 y. diam., ar- 

 ranged in broad lines radiating from the base or evenly distrib- 

 uted; nodes of the net varying in shape and size, flat, polygonal, 

 triangular, elongate, or branching, often not expanded and con- 

 vex, charged with dark plasmodic granules, and connected by yel- 

 lowish or brown threads; net sometimes lax and incomplete, with 

 free hooked ends between the threads. Stalk stout, 0.5 to 2.5 



