270 Mycetozoa of North America 



the inner membranous. Capillitium somewhat scanty, often 

 absent entirely, consisting of simple or acutely branching, slender, 

 pale brown threads 0.5-1.5 /x diam., nearly smooth or marked 

 with a single prominent spiral band, or for a short distance with 

 three spiral bands, often with scattered bead-like thickenings; 

 threads attached above and below by very slender attachments 

 to the sporangial wall. Spores pale yellow by transmitted light, 

 adhering in clusters of four to six, minutely warted on the outer 

 side, irregular from pressure in the cluster, globose when sepa- 

 rated and swollen, 10-12 ju diam. 

 Type locality: Sande, Norway. 

 Habitat: On dead coniferous wood. 



Distribution: *Alberta, Colorado, *New Hampshire, On- 

 tario, Oregon, Pennsylvania, *Quebec, *Washington. 

 Illustration: Lister, Mycetozoa ed. 3. pi. 193. 

 This species is usually associated with Licea flexuosa and may 

 resemble phases of the latter except for the clustered spores. A 

 specimen collected by Dr. Morton E. Peck in Oregon is practically 

 typical, with a fairly abundant capillitium. All specimens from 

 Colorado, Ontario, and Pennsylvania have no capillitium, or at 

 least it is so scanty that no threads were observed. The species 

 also resembles superficially Enteridium liceoides, a form so far 

 unknown from North America (see Enteridium olivaceum). The 

 latter has the inner structure of an Enteridium, instead of threads, 

 and the clustered spores are darker. In some collections of 

 D. corticatum without capillitium, there may be seen minute 

 protuberances on the inner side of the sporangial wall. In all 

 specimens here, including those from Europe, the spores are pale 

 yellow and the minute warts may often be observed on the edges. 

 Miss Lister verified one of the Colorado specimens, calling atten- 

 tion to the absence of the capillitium and that occasional Euro- 

 pean specimens were similar. This is confirmed by the absence 

 of the capillitium in some of the European specimens here. 



Genus 47. PROTOTRICHIA Rostafinski, Mon. App. 38. 

 1876. 



Sporangia sessile or stalked; capillitial threads arising from 

 the base of the sporangium as stout strands marked with spiral 

 thickenings, dividing above into pencils of slender branches 

 attached by the tips to the upper part of the sporangial wall. 



A single species. 



