384 The Myxomycetes of the United States. 



-FAMILY 3. PHYSARACE^. 



Genus 3. Physarum P. 



3. Physarum lividum R. 



Physarum effusum Link, Herb. 



Physarum griseum Link, Diss., ii, 42. 



Spumaria licheniformis Schvvz., Amer. Bor., No. 2364. 



Didymium glaucum Phillips, in Grevillea, V, 113. 



San Fraucisco (Harkness). 

 Var. B. licheniformis Schw. 



Spores •01--0125 mm . 



This variety is the United States form. If Physarum effusum Schw., 

 Am. Bor., 2297, is the same as Link's, it also belongs to this species. 



Bethlehem (Schw.). 



4. Physarum: didermoides (Ach). 



Diderma oblongum Schum., Saell. 1423. 



Didymium congestum B. and Br., Ann. N. II., 1850, p. 365. Cooke, Hdbk. 

 No. 1130. 



Spores -0125— •014 ram . 

 Car. (fide Rostafinski). 



5. Physarum auriscalpium Cooke. 



Sporangia globose, depressed, ochrey yellow, covered with orange 

 mealy scales above, with a very short, almost obsolete, stem. Columella 

 not evident. Capillitium sti-ongly developed, expanded at the angles, 

 which are filled with yellow granules of lime, combined into a network ; 

 deposits of lime in irregular angular masses. Spores violet-brown, nearly 

 smooth or minutely warted, .013— .015 mm . diam. Cooke, Brit. Myx., fig. 253. 



On rotten wood. Carolina (Ravenel, No. 1854). 



6. Physarum schumacheri Spr. 



Physarum compactum Ehr., Syl. Ber., 21. Schw., Am. Bor., No. 2283. 

 Physarum citrinum Schum., Saell., 1436. 

 Diderma citrinum Fries, Sys. Myc, iii, 100. 

 Didymium melleum B. and Br., Cey., No. 751. 

 Didymium chrysopeplum B. and C, Grev., No. 348. 

 Spores -007— •011™ m . 



Car. (Schw.). 



This is probably the species intended by Schweinitz. 



7. Physarum sulphureum A. and S., t. 6, fig. 1. 

 Physarum sulphureum Schw., Amer. Bor., No. 2289. 

 Spores -01— •011 mm . 

 On dead leaves. Car. (Schw., Curt.). 



