[Vol. 12 

 244 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



28. P. ludoviciana Burt, n. sp. 



Type: in Burt Herb., and Farlow Herb, probably. 



Fructifications effused, adnate, very thin, buff-yellow, dark- 

 ening to cinnamon-buff in the herbarium, hymenium subvelu- 

 tinous, not waxy, not cracking, the margin thinning out, paler; 

 in section 40-75 [i thick, not colored, composed of suberect, 

 branching, granule-incrusted, hyaline hj^Dhae 3-4 ;;. in diameter; 

 no gloeocystidia; cystidia hyaline, not incrusted, protruding 

 18-25 [L beyond the basidia; spores hyaline, even, 4-5 X 2}^- 

 Z}/2 iJ., somewhat flattened on one side. 



Fructifications 1-2)4. cm. long, Yi-^Yi cm. broad, becoming 

 confluent. 



On rotting decorticated wood of frondose species. Louisiana 

 and Michigan. August and April. Rare. 



P. ludoviciana closely resembles in aspect P. flammea and, 

 like the latter, is not separable from the substratum and gives no 

 noteworthy color changes when the sections are treated with 

 potassium, hydrate solution. Prolonged search has failed to find 

 any immersed cystidia. P. sulphurina has larger, cracked fruc- 

 tifications with shining hymenium and yellow subiculum. 



Specimens examined: 

 Louisiana: St. Martinville, A. B. Langlois, 1919, type, comm. by 



W. G. Farlow. 

 Michigan: Vermilion, A. H. W. Povah, 369 (in Mo. Bot. Gard. 



Herb., 13921). 



29. P. fusca Burt, n. sp. 

 Type: in Mo. Bot. Gard. Herb. 



Fructifications effused, closely adnate, very thin, drying ecru- 

 drab to drab, velvety, even, the margin not determinate, thinning 

 out; in structure 35-45 [x thick, not colored, composed of loosely 

 arranged, suberect, hyaline h^^phae more or less incrusted, 2»]/2~ 

 4 [JL in diameter under the incrustation, not nodose-septate; no 

 gloeocystidia nor conducting organs; cystidia hair-like, not in- 

 crusted, 7-12 ;x in diameter at the base, protruding 40-125 \i 

 beyond the basidia; basidia with 4 sterigmata; spores copious, 

 hyaline, even, 6-7 X 3K t^- 



Fructifications 2-6 cm. long, 1-2 cm. wide, becoming larger by 

 confluence. 



