1926) 



BURT — THELEPHORACEAE OF NORTH AMERICA. XV 331 



"Fructification resupinate, effused, coriaceous, in general cir- 

 cular in shape, more or less concentrically sulcate, separable from 

 substratum, roughly tomentose to strigose, army-brown to 

 Natal-brown when dry, the margin light drab to cinnamon-drab, 

 strigose; in structure lacunar, spongy, 1-1.8 mm. thick, individual 

 hyphae under the microscope clay-color to tawny olive, thick- 

 walled, even, 3-3.5 [x in diameter, loosely interwoven so as to 

 form a spongy structure with locules, branching to form a lighter 

 colored hjnnenium about 80-110 [l thick; probasidia terminal or 

 lateral, hyaline, pyriform to subglobose, 10-15 X 15-17 ^jl, 

 throughout hymenium; spore-bearing organs straight, hyaline, 

 54-66 X 6-7 [JL, 3-septate, growing from probasidia and pro- 

 jecting above hymenium; spores hyaline, simple, curved, 14-17.5 

 X 3-3.5 (x, borne singly from each of 3 cells of spore-bearing organ, 

 acropetally as far as observed. 



"Fructification 3-60 mm. but more commonly 10-35 mm. in 

 diameter, 1-1.8 nmi. thick." 



On bark of living Pinus Strobus in New England, New York, 

 and Pennsylvania, and probably co-extensive with the habitat 

 of this host ; also on Pinus monticola in Idaho. Found sporulating 

 after prolonged moist and rainy period in August. 



S. Spongia (Berk. & Curtis) Patouillard, Soc. Myc. Fr. Bui. 16: 

 181. 1900; Burt, Mo. Bot. Gard. Ann. 3: 339. texif. 11. 1916. 



From several collections of this species made by Dr. J. A. Stev- 

 enson in Porto Rico and San Domingo, additional characters have 

 been secured for completion of the description. 



Fructifications on leaves and stems of Citrus decumana and C 

 sinensis dry, warm sepia to Benzo-brown; probasidia at the 

 hymenial surface of a few filaments are hyaline, globose, 9 pl in 

 diameter; spore-bearing organs straight, cylindric-clavate; spores 

 simple, hyaline, curved, 9-10 X 3-4 [i, observed on the outer 

 cells of the organs. 



Sterile fructifications have been received from Dr. A. T. Speare, 

 collected on Citrus, at Okeechobee, Florida. 



