428 Arthur and Kern : Peridermium 



19. Peridermium decolorans Peck, Rep. N. Y. 



State Mus. 27: 104. 1875 



Peridermium abietinum decolorans Thuem. Mitth. Forstl. Vers. 



Oest. 2 : 321 (25). 1880. 

 Aecidium decolorans Farl. Bibl. Index I : 38. 1905. 



0. Pycnia amphigenous, numerous, forming a row on each 

 leaf-face, prominent, punctiform, honey-yellow becoming reddish- 

 brown, subepidermal, flask-shaped, 105-145," broad. 



1. Aecia from a limited mycelium, not changing form of leaf, 

 hypophyllous, in two rows on yellowish spots occupying a part 

 or all of a leaf, much compressed, erumpent from slits 0.5—3 tnm. 

 long, low, 0.5 mm. or less high, dehiscent at apex and readily 

 falling away ; peridium colorless, delicate, margin finely lacerate, 

 cells abutted, sometimes slightly overlapping, outer wall and por- 

 tions in contact strongly thickened, moderately verrucose, appear- 

 ing transversely striate in section, inner wall smooth and thin ; 

 aeciospores broadly ellipsoid or globoid, 22— 40 by 27—55//, wall 

 colorless, thick, 3-6 /j, densely and finely verrucose, intercalary 

 cells noticeable, about 5 by 7 ft ; contents orange-red, fading to 

 nearly colorless. 



On Picea Mariana (Mill.) B. S. P. {Abies nigra Desf.), Mt. 

 Colvin, Adirondack Mountains, New York, August 1873, Chas. H. 

 Peck (type specimen in Herb. N. Y. State Museum, Albany, 

 N. Y.) ; King's Ravine, Mt. Adams, New Hampshire, August, 

 1882, IV. G. Farlow (in Ellis, N. A. F. no. 1024) ; Mt. Washing- 

 ton, New Hampshire, September, 1884, W. G. Fa rlozv (in Rab.- 

 Wint. Fungi Eur. no. 3607) ; Holly Bay, Newfoundland, August 



l 



6, 1S94, Robinson & Schrenk ; North East Harbor, Maine, Au- 

 gust, 1902, Miss T. McV. Hinton (specimen in herbarium U. S. 

 Dept. Agric.) ; Mt. Adams, New Hampshire, no date, W. G. Far- 

 law ; South West Point, Anticosti Island, Quebec, no date {Ma- 

 conn?) (specimen in Crypt. Herb. Harvard University). 



On Picea rubra (Lamb.) Link (P. rubens Sarg.), Nipple Top, 

 Adirondack Mountains, New York, August, 1873, Chas. H. Peck ; 

 Sand Lake, New York, August (year?), Chas. H. Peck ; Adiron- 

 dack Mountains, New York, August, 1873, Chas. H. Peck (one or 

 more specimens in N. Y. State Museum, Albany, N. Y.) ; Prince 

 Edward Island, Sept. 8, 1888 {Macoun ?) #jj ; Mt. Washing- 

 ton, New Hampshire, August 16, 1895, E.J. Harper 267. 



On Picea Engelmanni (Parry) Engelm., Lake Louise, Canada, 



