[Vol. 7 



226 



ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Specimens examined: 

 Italy: Florence, Martelli, comm. by G. Bresadola. 

 Florida: C. G. Lloyd, 4846. 

 Venezuela: Fendler, 177 (in Curtis Herb.)- 



75. S. durum Burt, n. sp. Plate 6, fig. 75. 



Type: in Smith, Central Am. Fungi, 147, copy in Mo. Bot. 

 Card. Herb. 



Fructification very hard, orbicular, attached by the center, 

 free or reflexed all around, concentrically sulcate, fuscous to 



bone-brown, with a horn-like crust, 

 becoming somewhat shining; hyme- 

 nium even, not shining, between pale 

 drab-gray and tilleul-buff, somewhat 

 pruinose; in structure 2-3 mm. thick, 

 hazel throughout, and multizonate or 

 stratose, containing many scattered 

 crystals, hyphae 3§-4 n in diameter; 

 paraphyses of bottle-brush or aculeate 

 form, numerous and conspicuous in 

 the hymenial surface, cylindric, 12-15 

 X4-5 /x; no cystidia; no spores found. 

 Fructification 3 cm. in diameter, 

 reflexed 1 cm. 



On dead wood. Mexico. 

 S. durum is much thicker, harder, 

 and more rigid than S. insigne and 

 not tomentose. The microscopic structure agrees exactly with 

 that of preparations from an authentic specimen in Kew 

 Herbarium of Stereum annosum, No. 99, collected at Neil- 

 gherries, Ceylon, and should be compared with the latter 

 when better known. For the present the development of a 

 pileus by S. durum, with characters as stated, is reason for 

 regarding this species as distinct from S. annosum, a resupinate 

 species of the other side of the world. 



Specimens examined: 

 Exsiccati: Smith, Central Am. Fungi, 147, under the name 



Stereum ferreum. 

 Mexico: Jalapa, C. L. Smith, type, in Smith, Central Am. Fungi, 

 147. 



Fig. 46. S. durum. Section 

 of hymenial region of type X 

 90; bottle-brush paraphyses, p, 

 X 665. 



