MICHIGAN COLLECTIONS OF MYXOMYCETES. 



BY H. C. BEARDSLEE. 



The list which accompanies this is the record of species of Myxomy- 

 cetes collected in Montmorency Co., Mich., during August in two different 

 summers. It will be found to be incomplete on account of the short 

 duration of the collecting season. A number of species which may 

 reasonably be expected in the region studied were not detected. Some 

 of these may possibly have appeared later in the season. 



Of the species found a few seem of especial interest. Phifsarum 

 diderma Rost. and P. leucopus Link are both very rare. Both are so dis- 

 tinct and the material so good that there can be no doubt of the identity 

 of the specimens found. 



It has seemed best to use the nomenclature of Macbride's Manual. 



Fulicjo ovata (Schaeff.) Macbr. Common. 



Physarum sinuosum (Bull.) Weinm. 

 On old sticks. Common. 



Physarum diderma Rost. 



This species seems to have been detected few times. It is one of the 

 most distinct and beautiful of our species. In my specimens the 

 double peridium, with the outer layer pure white, seemed at first 

 sight to belong to Diderma. The capillitium is, however, clearly 

 that of Physarum. It was found only once. 



Physarum contextum Pers. 



On fallen twigs and stipes of ferns. 



Physarum virescens Ditm. 

 On old logs, not rare. 



Physarum cinereum (Batsch) Pers. 

 On blades of grass. Often in rings. 



Physarum plumbeum Fries. 

 On old leaves. 



Physarum atrum Schw. 



My specimens are in close accord with some from Pennsylvania. They 

 are close to other species of this genus, but seem distinct. 



l!»th Mich. Acad. Sci. Kept., 1917. 



