23i3 



Mycologia 



Gymnosporangium corniculans Kern sp. nov. 



0. Pycnia epiphyllous, gregarious, in small groups o. 5-1 mm. 

 across, on discolored spots, rather prominent and conspicuous, 

 honey-yellow, becoming blackish, slightly flattened globose, 130- 

 175/X in diameter by 130-160/A high; ostiolar filaments 50-80/x 

 long. 



1. Aecia hypophyllous, crowded in irregular or annular groups, 

 2-5 mm. across, cylindrical or horn-shaped, acutish at apex, 2-3.5 

 mm. high; peridium tardily dehiscent by longitudinal slits along 

 the sides, peridial cells usually seen in face view, broadly lanceo- 

 late, 16-23 by 64-96)11, inner and side walls rather thick, 5-7/x, 

 moderately verrucose with oval or roundish papillae and a few 

 elongated papillae interspersed, outer wall thin, i.^-2fi, smooth; 

 aeciospores globoid, 19-26 by 23-32/x, wall dark cinnamon-brown, 

 rather thick, 3-4./X, finely verrucose, appearing nearly smooth. 



On Amelanchier canadensis (L.) Medic, Burlington, Vt., Sept. 

 25, 1897, W. A. Orton; Fort Spring, W. Va., Sept. 14, 1906, 

 /. L. Sheldon; Granville, Mass., Sept. 22, 1890, A. B. Seymour 

 (Seym. & Earle, Econ. Fungi 248'^) ; Amelanchier erecta Blanch., 

 Isle Royale, Mich., Aug. 28, 1901, Stuntz & Allen; Leland, Mich., 

 Sept. 7, 1908, Arthur & Kern; Amelanchier intermedia Spach, 

 Taughannock Falls, N. Y., Sept. 3, 1908, Whetzel, Wallace & 

 Reddick. 



III. Telia caulicolous, from a perennial mycelium, appearing 

 on irregularly lobed, gall-like excrescences 2-15 mm. or more in 

 diameter, unevenly distributed, often separated by the scars of 

 the sori of previous seasons, conical or cylindrical-acuminate, 

 1.5-2 mm. in diameter at the base by 3-5 mm. high, dark chestnut- 

 brown; teliospores 2-celled, ellipsoid, 18-21 by 35-50/x, slightly or 

 not constricted at the septum, slight hyaline thickenings over the 

 germ-pores, wall cinnamon-brown, thin 1-1.5/x; pedicel uniform, 

 long; pores 1-2 in each cell, near the septum. 



On Jnniperus horisontalis Moench, Leland, Mich., June 4, 1909, 

 F . D. Kern. 



4. Gymnosporangium sp. nov. — Among the material collected 

 at Santee Canal, S. C. by Mr. F. D. Kern on March 18, 1909, 

 was an abundance of telia on Juniperus virginiana, in part ex- 

 tending along the smaller branches often for a foot or more, 

 and referred to above under unsuccessful cultures, and in part 

 forming rather distinct globoid galls from very small up to a half 

 inch or even more in diameter. It was difficult to tell in the field 

 whether there were two species associated or only the incidental 



