256 



Mycologia 



Placosphaeria decipiens Dearness & Fairman sp. nov. 



Stromata brown or dull black, subcircular, 1-3 mm. in diam. r 

 more frequently linear or effuse, on areas which are red at first; 

 pycnidia black, sub-carbonaceous, hemispheric, 90-200 /x, one or 

 mostly several in a linear series arising more than half their height 

 above the basal stroma, normally 4-sulcate at top ; conidia cylindric 

 with rounded ends, hyaline, nucleate, 12-35X4-6/*, the longer 

 ones sometimes seeming uniseptate. 



On leaves, flower-bracts 2nd stems of living Aster vallicola 

 Greene, Ute Park, Colfax Co., Sept., 1916, Paul C. Standley, No. 



The affected branchlets become completely darkened with the 

 stromata, — very closely simulating Dothidca (Ophiodothis or 

 Phyllachora) Haydcni B. & C. but lacking the shining luster of 

 the latter as well as its depressed and serpentine perithecia. 

 Specimens were sent to Dr. Geo. F. Atkinson who has (Jour, 

 of Mycol. 11: 257) recorded the results of his examination of 

 the specimens of Dothidca Haydcni from the Kew Herbarium. 

 Atkinson says, in. lit t . , " The spores are larger than those of the 

 type of 0. Haydcni and also larger than those of F. Col. No. 1332. 

 They are also different in shape according to my observations,, 

 that is, they are not attenuate at the ends." The feature of the 

 longer spores being 2-celled or at least with the plasma divided 

 was not observed in F. Col. No. 1332, nor in the type of D. 

 Haydcni. In this respect the fungus on Aster vallicola ap- 

 proaches Placosphaerclla. 



Phaeosporae 



Coniothyrium sepium sp. nov. 



Pycnidia scattered or gregarious, immersed then pustuliform- 

 erumpent, subglobose or lenticular, thin-walled, fragile, apparently 

 astomous, black (brown under the microscope) about 100-250^ 

 in diam. ; basidia not seen ; spores very numerous, rounded or 

 ellipsoid, ends usually rounded, at times subacuminate or pseudo- 

 apiculate at one end, cell walls thick and dark brown, cell contents- 

 light brown and minutely punctate, 1 or more guttulate, 6.66- 

 10 X 6.66 /x. 



On old stems of Convolvulus sepium L. (14578). 



