New Species of Peridermium 



241 



Aecia flattened at first, often becoming tongue shaped when 

 fully mature, few, usually clustered, 0.8 to 1.8 mm. high by 0.5 

 to 1.2 mm. long, averaging 1.3 by 0.8 mm., rupturing longitudi- 

 nally with coarsely toothed edges ; peridial cells ovoid to ellipsoid, 

 13 to 25 by 27 to 43 fi, averaging 19 by 40 /x, with walls 2 to 4^ 

 thick; aeciospores ovoid to ellipsoid, often pointed at one end, 15 

 to 20 by 20 to 28 /x, averaging 17 by 23x1, with walls 1.2 to 2.8 /x 

 thick, rugose with numerous small tubercles 0.6 to 1.2 fi thick, 1 

 to 2 ix long. 



Peridermium helianthi has been collected only on Pinus vir- 

 giniana but it probably will be found later on Pinus echinata. It 

 has been collected in Pennsylvania, North Carolina, South Caro- 

 ilna, Tennessee, West Virginia, and Virginia. 



The type of the species is F. P. 22236, collected by Hedgcock 

 on Pinus virginiana near Greenville, S. C, Apr. 29, 1916. 



This species is morphologically very similar to Peridermium 

 inconspicuum Long, but proof is lacking of the identity of the 

 two species. 



4. Peridermium fragile sp. nov. 



Pycnia amphigenous, single or few in one or two rows, either 

 near to or on opposite sides from the aecia on yellow green to 

 viridine green areas on the needles, dark olive to olivaceous black, 

 0.4 to 0.5 mm. wide by 0.5 to 0.9 mm. long, averaging 0.4 by 0.6 

 mm. 



Aecia small and inconspicuous, flattened laterally, few, scatter- 

 ing or in groups, 0.4 to 0.5 mm. high by 0.8 to 2 mm. long, aver- 

 aging 0.4 by 1.3 mm. ; peridia rupturing longitudinally with irreg- 

 ularly notched edges ; peridial cells slightly overlapping, ovoid to 

 ellipsoid in face view, frequently pointed at both ends, 17 to 25 

 by 37 to 46 /x, averaging 21 by 41 /x, with walls 4 to 8 /x thick, the 

 inner verrucose with numerous, crowded papillae 1.1 to 1.9 /x 

 thick and 4.1 to 5.6 /x long, averaging 1.4 by 5.0 xt; aeciospores 

 ovoid to ellipsoid, 18 to 22 by 25 to 34 /x, averaging 21 by 31x1, 

 with walls 2 to 3 /x thick, the outer surface closely verrucose with 

 irregularly arranged rows of more or less deciduous tubercles, 1.8 

 to 2.4 /ul thick, and 1.7 to 3.2 /x long. 



Peridermium fragile has been collected on Pinus palustris in 

 Florida and Georgia, Pinus tacda in Florida, and on Pinus rigida 

 in New Jersey. 



The type of the species is F. P. 17426, collected by Hedgcock 

 on Pinus palustris at Brooksville, Fla., Mar. 11, 1915. 



