The Myxomycetes of the United States. 391 



Family 4. DID YMI ACEiE. 

 Genus 12. Didymium Schr. 



SUB-GEN. ClONIUM. 



46. Didymium clavus (A. and S.). 

 Physarum clavus A. and S., Consp., t. 2, f. 2. Schvv., Am. Bor., No. 2281. 

 Scores -00G5— -0083 mm . 

 On dead leaves. Car. (Schw., Curt.) ; Canada (Poe) ; Boston (Farlow). 



47. Didymium farinaceum Schrad, t. 3, f. 6. 

 Physarum farinaceum Pers., Syn., 174. Schw., Am. Bor., 2280. 

 Didymium lobatum Nees, f. 101. Schwz., Am. Bor., No. 2270. 

 Physarum melanopus Fr., Gast., 25. 

 Didymium melanopus Fr., Sys. Myc, Hi, 114. 

 Didymium physarioides Klotsch. 



Spores -01— -0125 mm . 

 On fallen leaves, etc. New York (Torr., Peck); N. Eng. (Russell); 

 Car. (Curt., Schw.); Bethlehem (Schw.). 



48. Didymium granuliferum Phillips. In Grevillea, V, p. 114, t. 88, fig. 1. 



On herbaceous stems. San Francisco (Harkness). 



49. Didymium microcarpon (Fr.). 

 Physarum microcarpon Fr., Gast., 23. 

 Didymium nigripes Fr., Sys. Myc, iii, 119. * 



Didymium xanthopus Fr., Sys. Myc, iii, 120. 

 Physarum xanthopus Schw., Am. Bor., 2288. 

 Didymium megalosporum B. and C, Grev., No. 349. 

 Spores -0058— •0065 mm . 



On fallen leaves. Bethlehem (Schw.); Car. (Curt.); Conn. (Wright); 

 Boston (Farlow); N. York (Denslow) ; Maine (Bolles). 



50. Didymium physarioides Fr., Gast., 21. Curt., Cat., p. 112. 

 Spumaria physarioides Pers., Syn., 163. 



Spores -012— •014 m,n . 

 On bark of trunks. Car. (Curt.). 



SUB-GEN. ACIONISCIUM. 



51. Didymium squamulosum A. and S., t. 4, f. 5. Schw., Am. Bor., 2271. 

 Diderma squamulosum A. and S., t. 4, f. 5. 

 Didymium herbarum Fr., Sys. Myc, iii, 120. 

 Didymium leucopus Fr., Sys. Myc, iii, 121. 

 Didymium costatum Fr., Sys. Myc, iii, 118. 



Spores -0085— -01 mm . 

 On fallen leaves. Car. (Schw., Curt.) ; Penn. (Schw.) : Conn. (Wright) ; 

 N. York (Peck) ; San Francisco (Harkness). 



