The Myxomycetes of the United States. 385 



8. Physarum leucopus Link, Diss., ii, 42. Schw., Amer. Bor., 2275. 

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



Physarum bullatum Ditin., t. 22. 



Spores -0095— •011 Mm . 

 Bethlehem (Schw.). 



9. Physarum cinerkum (Batsch). Schw., Amer. Bor., No. 2291. Rav., 



Fun. Car., i, 79. 



Didymium cinereum Fries, Sys. Myc, iii, 126. 

 Physarum plumbeum Fries, Sys. Myc, iii, 142. 

 Didymium terrigenum B. and C. 



Spores -0075 — 013 ram . 



On leaves, twigs, etc. Car. (Schw.); New York (Schw., Peck); Car. 

 (Cur., Bav.) ; San Francisco (Harkness). 



\_Physarum luteo-valve Schw., Am. Bor., 2298, is very uncertain. Friea 

 has referred it to Perichasna, and Rostaflnski does not venture to refer it 

 to anything.] 



10. Physarum psittacinum Ditm., t. 62. 

 Didymium fulvipes Fr., Stirp. 

 Didymium erythrinum Berk., Grev., No. 344. 

 Didymium Pavenelii B. and C, Grev., No. 346. 

 Spores -0083— -0092 mm . 



On damp putrid logs. Car. (Rav.). 



11. Physarum pulciierrimum B. and Curt. In N. A. Fungi, Grevillea, 

 No. 354. Rav., Fungi Car., ii, 77. 



Spores -0083— -0092 mm . 

 On dead pine wood. Car. (Rav.) ; Penn. (Mich.). 



12. Physarum Berkeleyi Rtfki., Mon. p. 105. 

 Physarum flavicomum Berk., in Hook., Journ., 1845, p. 66. 

 Physarum cupriceps B. and Rav., in Rav., Fungi Car., iii, 76. 

 Physarum cupripes B. and Rav., in Grevillea, vol. iii, p. 65. 

 Physarum roseum B. and Br., Grevillea, vol. iii, p. 65. 



On dead wood. 



Spores -0083— -01 mm . 

 Car. (Rav.). 



Physarum pulcherripes Peck, is probably referable to this very variable 

 SDecies. 



13. Physarum Ditmari Rost. 

 Physarum virescens Ditm., Sturm, t. 61. 

 Physarum thejoteum Fr., Gast., p. 21. 

 Didymium nectriceforme B. and C, Grev., 353. 

 Didymium croceo-flavum B. and Br., Cey., 757. 

 Spores -006— -009 mm . 

 New England (Murray) ; Carolina (Ravenel) ; New York (Peck). 



