Murrill: Polyporaceae of North America 607 



Boletus resinosus Schrad. Spic Fl. Ger. 171. 1794- 

 Trametes benzoina Fr. Epicr. 489. 1838. — Icon. pi. 483./. 2. 



This large and striking species was originally described from 

 Carniola by Scopoli. It is quite abundant in temperate regions of 

 Europe and North America on fallen trunks of basswood, beech, 

 maple, fir, spruce, etc. On account of its habit of growing be- 

 neath logs, the fruit-bodies often persist in a good state of preser- 

 vation until the following spring. Logs are frequently found 

 entirely covered on the under side with these extensive hymeno- 

 phores. Whether the form found on coniferous wood is the same 

 as that occurring on hard wood is an old question. There seems 

 to be usually some difference in size and color, but after examin- 

 ing a large assortment of specimens, it seems impossible to distin- 

 guish the forms specifically either in this country or in Europe. 

 More specimens from coniferous trees in this country would doubt- 

 less throw light on the question. 



The following specimens have been examined in the Garden 

 herbarium : Ell. N. A. Fung. 406 ; Shear, N. Y. Fung. 112 ; Kel- 

 lerman, Ohio Fung. 105; Canada, Dcamcss, Macoun ; New York, 

 Earlc, Atkinson, Miss Overacker, Murrill; Delaware, Commons ; 

 Pennsylvania, Su Justine ; West Virginia, Nuttall ; Virginia, Richer ; 

 Ohio, James, Lloyd, Kclsey, Kcllcrman ; Michigan, Merrow ; Wis- 

 consin, Baker ; Alabama, Earle ; Florida, Calkins ; Tyrol, Bresa- 



dola & Murrill. 



Laetiporus gen. nov. 



Hymenophore annual, epixylous, fleshy, anoderm, caespitose- 

 multiplex ; context cheesy to fragile, light-colored, tubes thin- 

 walled, fragile, bright yellow, mouths irregularly polygonal ; 

 spores smooth, hyaline. 



This genus is based on Agaricus speciosus Batarr. Fung. Hist. 

 68. pi. ,y. f. B. 1755, commonly known as Poly poms sulphureus 

 Fr. It may be at once distinguished from species of Grifola by 

 its yellow color and arboreal habit. The generic name chosen 

 refers to the brilliantly colored hymenium. 



Laetiporus speciosus (Batarr.) 



Agaricus speciosus Batarr. Fung. Hist. 68. //. J4. f. B. 1755. 

 Boletus sulphureus Bull. Herb. France,//. 429. 1788. 

 Boletus citrinus Planer, Ind. Plant. Erf. 26. 1788. 



