Orcadella 209 



Distribution: Iowa, *Maine, New Hampshire, Pennsylvania, 

 *Vermont. 



Illustration: Lister, Mycetozoa ed. 3. pi. 149, jigs. d-f. 



All collections from North America have stalked sporangia; 

 a sessile variety has been recorded from England. The form is so 

 small, and concolorous with the habitat, that it is almost impossi- 

 ble to find it except accidentally along with a larger form. 



2. Orcadella parasitica (Zukal) Hagelstein, Mycologia 34: 258. 

 1942. 



Hymenobolina parasitica Zukal, Oester. Bot. Zeitschr. 43: 133. 1893. (N. Y. 



B. G. no. 5728, type material.) 

 Hymenobolina pedicellata Gilb. Univ. la. Stud. Nat. Hist. 16: 153. 1934. 



(N. Y. B. G. no. 6885, type material.) 

 Licea parasitica (Zukal) Martin, Mycologia 34: 702. 1942. 

 Licea pedicellata Gilb.; Martin, Mycologia 34: 702. 1942. 



Plasmodium rosy-red (Lister). Sporangia scattered, usually 

 sessile, rarely stalked, subglobose, 0.05 to 0.2 mm. diam., grayish 

 or black, opaque, rarely brownish and glossy when deposits of 

 refuse matter are scanty, dehiscing by a well-defined lid or 

 irregularly, the lid absent; lid smooth or areolated with prominent 

 ridges; sporangial wall membranous, pale purplish, minutely pa- 

 pillose on the inner surface of the lid or throughout, usually 

 invested with a thick layer of refuse matter in the lower part. 

 Spores shining, brown in mass, grayish brown by transmitted 

 light, smooth, with a paler area of dehiscence, 11-16 ju diam. 



Type locality: Yugoslavia. 



Habitat: On bark. 



Distribution: Iowa, New York, Pennsylvania, *West Vir- 

 ginia. 



Illustration: Lister, Mycetozoa ed. 3. pi. 217, jigs, h-k, as 

 Hymenobolina parasitica. 



Natural developments of this species were personally collected 

 in New York and Pennsylvania, one of which consisted of a 

 hundred or more sporangia closely scattered over dead bark and 

 the mosses and lichens thereon. Presumably they came from a 

 common plasmodium. The spores in this gathering are globose, 

 distinctly grayish by transmitted light, measuring uniformly 

 about 12 (jL. The lids are absent occasionally, and the sporangia 

 vary much in size. In moist chamber developments on wood 

 from another New York locality, there are also sporangia seated 



