392 The Myxomycetes of the United States. 



52. DlDYMIUM CONFLUENS PerS. 



Physarum confluens Fr., S. M., iii, 124. Schw., Am Bor., 2292. 

 Didymium effusum Link, Obs. 



Spores -01— •011 nan . 



On stumps. Car. (Schw., Curt.). 



I 



53. Didymium proximum B. and C. In Grev., N. A. Fungi, No. 345. 



Didymium pusillum B. and C, Grev., No. 347. 

 On dead pine leaves and herbs. Car. (Curt.). 



The following species are inadequately described to meet 

 the requirements of the present classification. 



54. Didymium simulans Howe, in Bulletin Torr. Bot. Club., VI, 30. 

 On bark and wood of Ailanthus. N. York (Howe). 



55. Didymium subroseum Peck, N. Y. State Museum Reports. 

 Spores globose, smooth, •008 mm . 

 On bark of Juglans cinerea. N. York (Peck). 



56. Didymium flavidum Peck, N. Y. State Museum Reports. 

 Spores globose, •01 mm . 

 On bark of Abies balsamea. N. York (Peck). 



Genus 13. Chondrioderma R. 



sub-gen A. Monoderma. 



57. Chondrioderma spumarioides (Fr.). 



Diderma spumarioides Fries, Sys.Myc.,iii, 104. Berk, and Curt. inGrevillea. 

 Carcerina spumarioides Fr., S. V. S., 451. 

 Diderma farinaceam Peck, in N. Y. Reports. 



Didymium oxalinum Peck, is probably the variety carcerina of the same 

 species. 



Spores -0083— •013 mm . 

 On moss, leaves, etc. Car. (Curt.). 



58. Chondrioderma albescens (Phil.). 



Diderma albescens Phillips, in Grevillea, V, pp. 114, t. 87, fig. 3. 

 Spores violet- black. 

 On pine bark. California (Harkuess). 



