[Vol. 13 

 192 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Burnham, comm. by N. Y. State Mus. Herb, (in Mo. Bot. 



Card. Herb., 56048). 

 Texas: Quitman, W. H. Long, 12092 (in N. Y. Bot. Card. Herb., 



and Mo. Bot. Gard. Herb., 61343). 

 Michigan: Ann Arbor, C. H. Kauffman, 18. 

 Minnesota: Princeton, C. J. Humphrey, 1030 (in Mo. Bot. Gard. 



Herb., 21779). 

 Washington: Bingen, W. N. Suksdorf, 905, 915. 

 Arizona: Flagstaff, W. H. Long, 19449 (in Mo. Bot. Gard. Herb., 



55141). 



11. C. sociatum Burt, n. sp. 

 Type: in Mo. Bot. Gard. Herb. 



Fructifications effused, small, closely adnate, very thin, white, 

 becoming continuous and somewhat waxy at the center, even, 

 barely cracked, the margin thinning out, with hyphae interwoven; 

 in section 70-90 [x thick, not colored, with the hyphae loosely 

 interwoven near the substratum, 3 ii in diameter, not incrusted, 

 not nodose-septate; no gloeocystidia ; basidia with 4 sterigmata; 

 spores hyaline, even, 10^-12 X 5-6 iji, copious; a few imbedded 

 spores present. 



Fructifications 2-10 mm. long, 1-3 mm. wide — 24 on an area 

 9 cm. long, 2 cm. wide. 



On bark of decajang logs of Thuja plicata. Manitoba and 

 British Columbia. August. 



C. sociatum is a white species belonging in the group with C 

 arachnoideum, C. centrifugum, and C. pelliculare but distinct by 

 the many small fructifications arranged near together, large 

 spores, and hyphae neither nodose-septate nor incrusted. 



Specimens examined: 

 Manitoba: Norway House, G. R. Bisby, 1466 (in Mo. Bot. Gard. 



Herb., 61649). 

 British Columbia: Kootenai Mts. near Salmo, J. R. Weir, 529, 



type (in Mo. Bot. Gard. Herb., 21596). 



12. C. scutellare Berk. & Curtis, Grevillea 2: 4. 1873; Sacc. 

 Syll. Fung. 6: 634. 1888; Massee, Linn. Soc. Bot. Jour. 27: 128. 

 1890. 



