238 THE MYXOMYCETES 



wall purplish or brown, of two layers with granular matter between; 

 pseudocapillitium of simple or forked columnar tubes connecting the 

 upper and lower walls; spores pale brown or olivaceous, clustered, 

 minutely warted on the exposed portion, 10-12 /x. Plasmodium rosy 

 pink. 



On coniferous wood, very rare in North America, if it occurs at all, 

 the only collection so referred being a specimen somewhat intermedi- 

 ate between this species and E. olivaceum, collected by Dr. Farlow 

 in New Hampshire. Not common in Europe. 



3. Enteridium olivaceum Ehrenb. 



Spreng. Jahrb. 1 : 57. 1818. 

 PI. XV, Figs. 389, 390, 391. 



1825. Reticularia versicolor Fr., Syst. Orb. Veg. 147. 1825. 



1829. Reticularia olivacea (Ehr.) Fr., Syst. Myc. 3 : 89. 



1851. Enteridium atrum Preuss, Linnaea 24 : 142. 



1866. Reticularia applanata Berk. & Br., Ann. Mag. Nat. Hist., 3 ser. 18 : 56. 



1869. Licea olivacea (Ehr.) Fuckel, Symb. Myc. 338. 



1873. Liccethalium olivaceum (Ehr.) Rost., Vers. 4. 



1888. Enteridium rostrupii Raunk., Bot. Tidssk. 17 : 48. 



1888. Enteridium macrosporum Raunk., Bot. Tidssk. 17 : 48. 



^EthaUum depressed, oval or elongate, 1 mm. to 3 cm. in greatest 

 extent, 0.6-3 mm. thick; surface glossy, smooth, greenish or olivaceous 

 brown; the pseudocapillitium composed of thin, pale olivaceous plates, 

 widely perforate with circular openings; spores in clusters, six or more 

 together, ovoid, distinctly warted at the wider end, pale olivaceous, 

 9-11 p. 



This, the type of the genus, is a very distinct species. Fries thought 

 it might represent a less perfectly developed reticularia, and therefore 

 wrote Reticularia olivacea, noting, however, the clustered spores and 

 the lack of hypothallus. 



New York, Washington, Oregon, California, South America; Europe. 



4. Enteridium minutum Sturgis 



Mycologia9 : 329. 1917. 



^Ethalia rounded or elongate, pulvinate, pale umber in color, seated 

 on a broad membranous base, 1.5-2 mm. in diameter; wall wrinkled 

 and usually marked with small scattered pits, pale yellow, membra- 

 nous; pseudocapillitium membranous, minutely roughened, perforated 

 with round openings, the margins of which show many free threads, 

 or reduced to irregular, anastomosing strands arising from the base 

 of the aethalium, with membranous or net-like expansions at the angles 



