716 



brownish disk, J-1J mm. long by 1 mm. wide (or a little less). Asci 

 elavate, 70-75x9-10 p, obtusely pointed at the apex, short-stipitate, 

 with filiform paraphyses hooked at the tips. Sporidia filiform, straight, 

 often a little swollen at the tips, continuous, hyaline, 45-50 x 1 J 2 p, 

 lying parallel. 



On dead leaves and petioles of Amelanchier alnifolia, Klikitat 

 Co., Washington (Suksdorf, No. 201), on oak leaves, Bethlehem, Pa. 

 (Schw.), on fallen beech leaves, New York (Peck). 



The species is specifically characterized by its swollen perithecia 

 with walls rising like an arch over the disk. It is found in Sweden 

 and Germany on leaves and petioles of Sorbus Aucuparia. The 

 sporidia (sec. Fries) are oval, which would place the species in Hypo- 

 derma. The Washington specc. have filiform sporidia agreeing with 

 the specc. issued by Rehm and Rornell. 



L. exaridum, C. & P. in Cke. Disc, of the U. S. p. 36. 



Hysterium exaridum, C. & P. in Pk. 29th Rep. p. 63. 



Perithecia scattered on pale, irregular shaped spots, suborbicular 

 or oblong, \-l\ mm. long, adnate, superficial, black, obtuse, minutely 

 rugose; lips slanting upwards, nearly closed, not swollen, hypophyl- 

 lous. Asci slender-clavate, 70-85 x 6-7 p, 8-spored, subsessile, with 

 filiform paraphyses more or less bent and thickened at the tips. Spo- 

 ridia filiform, multinucleate, hyaline, slightly thickened above, 60-70 x 



ii-ij p. 



On fallen leaves of Kalmia angustifolia, New York (Peck), on 

 dead, dried up leaves of Kalmia latifolia, still hanging on limbs cut 

 some months previously, at Newfield, N. J. 



Diagnosis from the Newfield specimens. 



L. petiolicolum, Fckl. Symb. p. 255. 



Exsicc. Fckl. F. Rh. 745. Kunze F. Sel. 276. Rab. F. F. 462. 2642. Thum. M. U. 1757. 



Perithecia on pale spots, innate-erumpent, subprominent, finally 

 collapsing, elliptical, subacute, straight, simple, shining-black, cleft 

 narrow, finally partially opening, so as partly to expose the pale disk, 

 l-l|x| mm.; lips not swollen. Asci elavate, obtusely pointed at 

 the apex, 8-spored, 45-70 x 6-7 p, with filiform paraphyses hooked at 

 the tip. Sporidia filiform, mostly straight, continuous, hyaline, 45-50 x 

 1 p, lying parallel. 



On petioles and midribs of fallen oak leaves, Newfield, N. J., on 

 petioles of Acer saccharinum, Caroga, N. Y. (Peck). 



