426 Wisconsin Academy of Sciences, Arts, and Letters. 
Stagonospora tetramera n. sp. 
Spots pale brown to sordid with a darker brown, indefinite 
margin, paler and usually immarginate below, oblong to ellipti¬ 
cal, about 1 cm. long, sometimes confluent; pycnidia scattered, 
epiphyllous-innate, black, ostiolate, globose to depressed-globose, 
100-150/a in diameter; sporules hyaline with coarsely granular 
cytoplasm, fusoid-cylindrical, obtuse and rounded at both ends, 
straight, triseptate, 55-75 x 10-13/a. On leaves of Car ex (riparia?) 
Madison, Wisconsin, September 16, 1919. 
Stagonospora petasitidis Ell. & Evht. 
On Petasites palmatus. Prentice. Sporules about 4 /a thick. 
Septoria angustifolia Ell. & Evht. 
On Kalmia polifolia. Mercer. In the collection referred to this 
species provisionally the spots are castaneous above, 2-5 mm. in 
diameter or sometimes longer when running along the leaf margin 
and the sporules are 30-60 x 1-1 %/a. The ‘ ‘ white-glaucous ’ ap¬ 
pearance of the lower surfaces of the leaves of the host is due 
to the numerous small white trichomes. 
Septoria xylostei Sacc. & Wint. 
Specimens on Lonicera canadensis collected at Saxon have been 
referred to this species. 
Fig. 3. A. A leaf of Vaccinium canadense bearing Piggotia vaccinii 
n. sp. Natural size. B. Vertical section of a pycnidium of the same 
magnified about 350 diameters. Drawn by Charles Drechsler with the aid 
of camera lucida. 
Piggotia vaccinii n. sp. (Fig. 3.) 
Spots suborbicular to semi-elliptical, reddish brown becoming 
paler and often mottled above, subolivaceous below, 1-2 cm. in 
length, sometimes confluent; pycnidia epiphyllous, scattered, 
