40 MURRILL : POLYPORACEAE OF NoRTH AMERICA 



October, 1901. It was found in considerable quantity growing 

 on decaying wood. There is also in the herbarium of the New 

 York Botanical Garden another good collection of this species 

 from Porto Rico made by Mr. and Mrs. A. A. Heller in March, 

 1899. It also grew on dead wood. This latter collection, how- 

 ever, is not considered typical. 



20. PoLYPORUS CAUDiciNUS (Scop.) Murrill 



Boletus caudicinus Scop. Fl. Carn. ed. 2, 2 : 469. 1772. 



Boletus Ji(gla7tdis Sc\\2i&^. Fung. 3: 75.//. 1 01-102. 1774- 



Boletus sqiiamosiis Huds. Fl. Angl. 614. 1778. 



Polyporus ^7//// Paul. Icon. Champ.//, /j. 1793. 



Polyporus squauiosus Fr. Syst. i : 343. 1821. 



Polyporus caudicinus Murrill, Jour. Myc. 9: 89. 1903. 



Exsicc. : France, Roumeguere 2'/o6, 2J0J, J4-0J ; Germany, 

 Krieger 860, Sydow 212, Magnus, Murrill ; Sweden, Murrill; 

 England, Murrill ; Canada, Dearness ; Connecticut, Underwood. 



This species is the largest of the genus and occurs in very con- 

 spicuous clusters on the trunks of injured deciduous trees in 

 Europe and America. In London and in some of the cities of 

 Germany I have found it especially abundant on elms, maples, 

 horse chestnuts and other shade trees. It is at present compara- 

 tively rare in America and need not here be seriously considered 

 from an economic standpoint for some years to come. 



Scopoli's description is not so clear and definite as might be 

 desired, but in the first variety described there can be no question 

 as to the plant he had in mind, for he speaks of it as multiple, 

 lobed, fleshy, large, growing on the trunks of trees, variegated 

 above with darker spots, light-colored beneath, with large polyg- 

 onal pores. The large pores connect it with the genus Hexa- 

 gona, but its general structure and habit are those of Polyporus. 

 Young plants collected ni Connecticut, by Underwood, in May, 

 showed very short favoloid tubes with thin toothed dissepiments, 

 a milk-white fleshy-tough context and a scaly pileus differing 

 little in color from that of the mature plant. The odor of the 

 fresh plant is strong and somewhat mealy ; the base of the stipe 

 is clothed with short dark-brown or black velvety tomentum. It 

 is quite possible that in this species we have modifications pro- 



