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 \l in diameter, loosely interwoven so as to 

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

 colored hymenium about 80-110 \l thick; probasidia terminal or 

 lateral, hyaline, pyriform to subglobose, 10-15 X 15-17 n, 

 throughout hymenium; spore-bearing organs straight, hyaline, 

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

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

 X 3-3.5 \L, 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 mm. thick.' ' 



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

 and Pennsylvania, and probably co-extensive with the habitat 

 of this host ; afso 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. textf. 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 \i in 

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

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

 cells of the organs. 



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

 collected on Citrus, at Okeechobee, Florida. 



