194 



Mycologia 



March 15, 1918. Hunt made inoculations March 27, 1918, with 

 the aeciospores from the latter collection on 2 plants of Verbesina 

 virginica without result. Collections of the fungus in the same 

 locality were made from different trees February 26 and 28, 

 1919, but no clues as to its alternate host were secured later in 

 the year during the season for telia. This rust approaches 

 Peridermium acicolum in its gross morphology but differs in the 

 color and arrangement of the pycnia, and in the arrangement of 

 the aecia on the leaves. It is here named Peridermium flori- 

 danum Hedge. & Hahn, with the following description : 



Pycnia amphigenous, several, usually in a single row on the 

 inner surfaces of the needles, on chlorotic spots, subcuticular, de- 

 hiscent by a longitudinal slit, tawny to russet, 0.36-0.8 mm. wide, 

 0.5-1.5 mm. long, 1-3 mm. high, averaging 0.52 by 1.04 by 0.15 

 mm. 



Aecia amphigenous, on chlorotic spots, usually in a single row 

 on the inner surfaces of the needles, 0.48-0.68 mm. wide, 0.9-3.6 

 mm. long, 0.76-2.16 mm. high, averaging 0.58 by 1.8 by 1.42 mm. ; 

 peridia flattened laterally, rupturing longitudinally at the apex 

 with irregularly notched edges, peridial cells usually not over- 

 lapping in one layer, occasionally two layers at the base ; ovoid to 

 ellipsoid or rhomboid, 17-32 by 32-78 /x, averaging 22 by 53 /x, 

 with walls 4-8 /a, averaging 5.4 /x, the outer walls thicker, walls 

 verrucose with crowded papillae 1-2 /x in diameter, 3-6 /x long, 

 averaging 1 by 4.4 /x aeciospores obovoid to ellipsoid, 12-20 by 22- 

 38 /x, averaging 17 by 29 /x, with walls 1-4 ft thick, averaging 3 ,/x, 

 the outer surface verrucose with short tubercles, 1-3 fx in diameter 

 by 1-4 fx long, averaging 1.5 by 2.6/x. 



This Peridermium has been collected only in Florida near Ocala 

 on Pimis palustris as follows: in 1916, March 17 (specimens 

 lost) ; in 1918, March 15 (25137) ; in 1919, February 26 (32129), 

 February 28 (32150, type of species). 



Peridermium intermedium 



From 1914 to 1919, collections of Peridermium intermedium 

 Am. Auct. from the needles of Pinus echinata were made from 

 Alabama, Arkansas, Georgia, North Carolina, South Carolina, 

 Tennessee and Texas. These were used in 18 sets of experi- 

 ments in which there were inoculated 192 plants of species of 



