414 Arthur and Kern: Peridermium 



I. Aecia from a limited mycelium, numerous, scattered, on dis- 

 colored spots occupying part of a leaf, erumpent from longitudinal 

 slits, flattened laterally, 0.5-1 mm. long by 0.5-0.7 mm. high, 

 rupturing irregularly ; peridium colorless, moderately firm, cells 

 overlapping, 35-45 fi long, not much narrower, walls transversely 

 striate, inner coarsely verrucose, thick, 5-6//, outer less rough 

 and somewhat thinner; aeciospores ellipsoid, 20— 24 by 28— 40 /i, 

 wall colorless, closely and coarsely verrucose with deciduous 

 tubercles, which are directed away from a smooth spot extending 

 up one side, thick, 2-3 fi on the smooth spot, increasing to 5-6/* 

 on the opposite side, including the tubercles. 



On leaves of Pinns rigida Mill., Egg Harbor, New Jersey, 

 June, 1 877, /. C. Martindale (specimen in Herb. N. Y. Botanical 

 Garden) ; Plainville, Connecticut, no date, J. N. Bishop (specimen 

 in N. Y. State Herb, at Albany) ; Sherburne, Massachusetts, 

 June 8, 1888, Gumming s & Seymour (in Seymour & Earle, Econ. 

 Fungi, no. 22j) ; May's Landing, New Jersey, July 4, 1888, 

 Penny packer (in Ellis & Everh. N. Am. Fungi, no. 2222) ; Belle- 

 plain, New Jersey, May 25, 1903, C. L. Shear 1457 ; Riverhead, 

 Long Island, New York, June 8, 1904, F. A. Sirrine (specimen 

 in N. Y. State Herb, at Albany). 



This species appears to be unique in having the tubercles on 

 the aeciospores noticeably bent away from the smooth toward the 

 opposite side, so that the longest tubercles directly opposite to the 

 smooth side are the only ones that are truly radial. The species 

 is known from only a small area along the Atlantic coast from 

 near Boston, Mass., to the southern end of New Jersey. 



4. Peridermium carneum (Bosc) Seym. & Earle, 



Econ. Fungi 550. 1899 



Mag. 5 



1811. 



Peridermium oblongisporinm Ravenelii Thum. Mitth. Forstl. Vers. 



Oest. 2 : 316 (20). 1880. 

 Peridermium Ravenelii YA^b. Ber. Deutsch. Bot. Ges. 8 2 : 69. 1890. 

 Aecidium Ravenelii Dietel, in Engler & Prantl, Pflanzenfam. I 1 ** : 



78. 1897. 



Aecidium carnenm Farl. Bibl. Index 1 : 25. 1905. 



O. Pycnia amphigenous, numerous, scattered, noticeable, sub- 

 corticular, dehiscent by a longitudinal slit, large, 0.4-0.7 mm. 

 broad by 1 — 1 . 5 mm. long, low-conoidal, 60-80 fi high. 



