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[Vol. 12 

 276 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Fructifications 2 J/2-4 cm. long, 1-1 3^ cm. wide. 



On bark of decaying Robinia neo-mexicana. New Mexico. 

 August. 



P. limonia has the color of P. sulphurina and P. carnosa but 

 differs from both by its occurrence on frondose bark and very 

 coarse, heavily incrusted hyphae. The hymenial layer does not 

 crack and flake away from the substratum like that of P. sul- 

 phurina. Treatment of sections with potassium hydrate solution 

 causes no color changes. 



Specimens examined: 

 New Mexico: Sulphur Canyon, W. H. Long, 21405, type (in 



Mo. Bot. Gard. Herb., 55146). 



55. P. amoena Burt, n. sp. 

 Type: in Mo. Bot. Gard. Herb. 



Fructifications long and broadly effused, thin, adnate, small 

 pieces separable when moistened, cream-color in the herbarium, 

 even, glabrous, the margin thinning out, of finely interwoven 

 hyphae; in section 120 \l thick, not colored, with the hyphae near 

 the substratum compactly interwoven, about 3 (i in diaiheter; 

 an incrusted subhymenial zone present, formed of numerous 

 incrusted bodies side by side; no gloeocystidia; cystidia of the 

 hymenial surface not incrusted, 7-9 y. in diameter, protruding 

 up to 45 [l; basidia rather large, 25-30 X 5-6 (x, with 4 sterig- 

 mata; spores hyaline, even, 12-15 X 4-6 \l, copious. 



Fructifications probably large, for pieces broken off at one end 

 and one side are 5-6 cm. long, 13^-2 cm. wide. 



On a soft wood of a frondose species. British Columbia. 



P. amoena forms cream-colored, somewhat waxy fructifications 

 on decorticated logs of a pale soft wood perhaps Populus. The 

 spores are so large as to afford a valuable specific character. 



Specimens examined: 

 British Columbia: Sidney, J. Macoun, 7, type (in Mo. Bot. Gard. 



Herb., 5766). 



56. P. firma Burt, n. sp. 

 Type: in Burt Herb. 



Fructifications effused, rather thick, dry, firm, membranaceous, 



