264 Mycetozoa of North America 



Sporangia and plasmodiocarps darker, thickly spotted with 

 prominent, blackish brown warts composed of refuse matter; 

 otherwise like the typical form. 



Type locality: Japan. 



Habitat: On dead wood and bark, and on living trees. 



Distribution: *Iowa (culture). New York, *Ontario (culture). 



Illustration: Lister, Mycetozoa ed. 3. pi. 187, jigs, d-f, as 

 Hemitrichia minor. 



As mentioned under P. corticalis, this species and its variety 

 were found in fair abundance in association, on the same log, with 

 many other forms of Perichaena. A few of the sporangia of 

 P. chrysosperma present on that log also had the dark, prominent 

 warts similar to those of P. minor var. pardina. Miss Lister 

 (Mycetozoa ed. 3. 244. 1925) notes a similar association with 

 P. chrysosperma, and with warts on the latter also, in a specimen 

 from Japan. P. minor may be a hybrid between two of the forms 

 present in those collections. It does not belong in the genus 

 Hemitrichia, as the diagonal lines, either dextral or sinistral, are 

 seen to be composed of small spines when properly resolved by 

 the microscope. The markings on the capillitium are similar to 

 those of P. vermicularis. Aside from the localities given the 

 species and variety have been reported only from England. 



5. Perichaena depressa Lib. PI. Crypt. Ard. (Fasc. 4) no. 378. 

 1837. 



Perichaena quadrata Macbr. N. A. Slime-Moulds 184. 1899; Hagelstein, 

 Mycologia 29: 401. 1957. 



Plasmodium milky white (Lister). Sporangia sessile, crowded, 

 polygonal from mutual pressure, flattened or somewhat convex, 

 sometimes arranged in chains, 0.3 to 1.5 mm. diam., red-brown, 

 purple-brown, nearly black, or gray from the presence of super- 

 ficial crystals of lime, dehiscing in a circumscissile manner, indi- 

 cated by a narrow, yellow area along the line of dehiscence; lower 

 part of the sporangial wall firm, persistent as a shallow base; 

 wall consisting of two layers, the outer charged with brown, 

 granular matter, often intermixed with crystals of lime, and con- 

 tracting in the upper part of the sporangium at maturity, sepa- 

 rating and curling away from the membranous inner layer, which 

 encloses the spores and may persist for some time; the two layers 

 often curl away together as a lid, Capillitium an abundant web 



