432 Arthur and Kern : Peridermium 



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

 Lake Sunapee, New Hampshire, July 30, 1891, and foot of Mt. 

 Lafayette, New Hampshire, July, 1895, W. G. Farlozv (both 

 specimens in Crypt. Herb, of Harvard Univ.). 



On cones of Picea rubra (Lamb.) Link (P. rubens Sarg.), Fulton 

 Chain, Herkimer County, New York, and North Elba, Essex 

 County, New York, no date, C/ias. H. Peck (both specimens in 



M 



(M 



M 



& Earle, Econ. Fungi no. 220). 



On cones of Picea Engelmanni (Parry) Engelm., Colorado, no 

 date, T. S. Brandegee ^yy (specimen in herbarium of N. Y. Bot. 

 Garden). 



On cones of Picea excelsa L., Newton, Massachusetts, August, 

 1874, W. G. Far law (specimen in Crypt. Herb, of Harvard Univ.). 



The species is probably rather common and widely distributed, 

 but owing to its occurrence high up on trees it is not often or 

 easily collected. It has been suggested by Rostrup that this is the 

 aecial form of Chrysomyxa Pyrolae (DC.) Rostr., but this has not 

 yet been fully confirmed. The geographical distribution of the 

 form on Pyrola in North America would favor this assumption. 



24. Peridermium columnare (A. & S.) Kunze & Schmidt, 



Deutschl. Schwamme 10. 181 5 



Aecidiinn columnare Alb. & Schw. Consp. Fung. Nisk. 121. 1805. 



0. Pycnia rarely if ever formed. 



1. Aecia from a limited mycelium, hypophyllous, numerous, 

 usually forming rows on either side of the midrib, cylindrical, 

 o. 1-0.15 mm. across, 0.4-0.7 mm. high; peridium colorless, deli- 

 cate, rupturing at apex, becoming irregularly lacerate, cells slightly 

 overlapping, inner wall finely verrucose, not noticeably striate, 

 2 - 5~3-5 ! l thick, outer wall of equal thickness, smooth ; aeciospores 

 globoid or broadly ellipsoid, 13-17 by 16-24 /i, wall colorless, 

 rather thin, 1 — 1.5 //, finely and closely verrucose. 



On Abies pectinate DC. (A. alba Mill.) in Europe, but not yet 



found in America. It has been proven by incontestable cultures 



to be the aecial stage of Calyptospora Goeppertiana Kuhn. The 



Calyptospora forms cylindrical swellings on stems of Vacciniuni, 



