192 PROCEEDINGS OF THE ACADEMY OF [1890. 



DESCRIPTIONS OF THREE NEW SPECIES OF MYXOMYCETES, WITH 



NOTES ON OTHER FORMS IN CENTURY XXV, OF ELLIS 



AND EVERH ART'S NORTH AMERICAN FUNGI. 



BY GEO. A. KEX. 



The ]\Iyxoniycetes recently issued in Century XXV of T^. A. 

 Fungi, E. and E., include an unusual number of representative 

 American species. The following specific diagnoses and descriptions 

 apply to three of these, which have hitherto been undescribed. 



Physarum tenerum n. sji., No. 2489. 



Sporangia stipitate, erect or nodding, exactly spherical in shape, 

 about ^ mm. in diameter ; wall of sporangium single, membrana- 

 ceous, but thickly studded with circular, flattened, yellow granules of 

 lime, rupturing when mature in a more or less regularly laciniate 

 manner. Stipes from 1 to 1 2 mm. in height, subulate, opaque, blen- 

 der, of a light yellow color above, shading into a light brown below, 

 longitudinally striate at the base or sometimes the entire length ; colu- 

 mella wanting. Capillitium white, delicate, forming a loosely but 

 regularly meshed network, with numerous small round or rounded 

 yellow lime granules at the intersections. Spores dark brown, 7.5 

 to 8 p.. in diameter, with a delicately warted epispore which, 

 however, is apparently smooth under a less amplification than about 

 700 diameters. 



Fairmount Park, Philadelphia ; Ohio, (Morgan.) 



This is a delicate graceful Physarum, very fragile and evanescent, 

 and seems to be distinct, by reason of its characteristic rounded lime 

 granules, from any similar stipitate species. It might be mistaken 

 for a globose form of Tllmadoche mutahUis but the capillitium is 

 sufficiently distinctive. 



The species varies somewhat according to locality, the Ohio speci- 

 mens being a little larger, and having thicker and more calcareous 

 stipes than is usual in the specimens found in the vicinity of Phila- 

 delphia. The walls of the sporangia when fully matured, generally 

 rupture into several petal-like segments which finally become re- 

 flexed. 



Trichia subfusca n. sp., No. 2495. 



Sporangia stipitate, simple, very rarely double or triple, generally 

 exactly spherical, exceptionally globose-turbinate, about 2 to i of a 



