Arthur and Kern: Peridermium 415 



I. Aecia amphigenous, from a limited mycelium, numerous, 

 scattered, on discolored spots occupying part of a leaf, erumpent 

 from longitudinal slits, flattened laterally, large, 1-6 mm. long by 

 0.8-1.5 mm - high, rupturing along the apical line ; peridium flesh- 

 colored, especially at apex, when fresh, becoming colorless, rather 

 firm, cells isodiametric, somewhat overlapping, 38-48/,* long, walls 

 transversely striate, inner coarsely verrucose, very thick, 7—1 3 /i, 

 outer less rough and slightly thinner ; aeciospores ellipsoid, 16- 

 24 by 26-38 [i, wall colorless, closely and uniformly verrucose 

 with large, deciduous tubercles, 5-7 u, or 2-3 ;t without tubercles. 



On leaves of Pinus palustris Mill. (P. australis Michx.), Gaines- 

 ville, Florida, February 12 and February 24, 1906, P. H. Rolfs. 



On leaves of Pinus Taeda L., Darien, Georgia, no date, H. W. 

 Ravenel (in Ellis, N. A. F. no. 1026a) ; Crescent City, Florida, no 

 date, George Martin (in Ellis, N. A. F. no. 1026b as on "Pinus 

 australis")) Green Cove Springs, Florida, February 23, 1883, 

 Geo. Martin (as on "P. australis") ; Kissimmee, Florida, March, 

 1885, E" -A- Ran (in Rabenhorst-Winter, F. Europ., no. 331 jl\ as 

 on M jR australis ") ; Toccoa, Georgia, April 19, 20 and 21, 1891, 

 L. M. Undenvood ; South Jacksonville, Florida, April, 1 891 , L. 

 M. Undenvood (as on "P. palustris") ; Auburn, Alabama, spring 

 of 1891, Geo. F. Atkinson (as on "P. serotiua"); Lake City, 

 Florida, February 28, 1892, P. H. Rolfs (as on " P. palustris") ; 

 Grassmere, Florida, March, 1893, W. C. Sturgis (in Seymour & 

 Earle, Econ. Fungi no. 330, as on "P. palustris") ; Auburn, Ala- 

 bama, April 18, 1896, Undenvood & Earle ; Gainesville, Florida, 

 February 12 and 24, 1906, P. H. Rolfs. 



On leaves of Pinus Elliottii Engelm., Ocean Springs, Missis- 

 sippi, March 31, 1895, F. S. Earle (as on (i P. australis")', Biloxi, 

 Mississippi, March 19, 1898, S. M. Tracy 5190 (as on "P. lutcro- 

 phylla")\ Live Oak, Florida, April 31, 1900, 5. M. Tracy ji jj 

 (as on "P. australis"); Cairo, Georgia, March 26, 1904, P. J. 



O'Gara. 



Beside the above collections one in the herbarium of the New 

 York Botanical Garden on Pinus Taeda, collected at Ft. Payne, 

 Alabama, in 1896, by L. M. Underwood, may belong here, 

 although both spores and peridial cells are smaller and thinner - 

 walled than usual. 



The species is very common along the coast of the south- 



