1914] 
VON SCHRENK—TWO TRUNK DISEASES OF MESQUITE 247 
wood on a mesquite (?) tree near Austin, Texas, in 1891. Mur- 
rill’s description of this fungus is as follows: 
“Pileus ungulate, attached by the vertex, 8 x 5 x 4 ст., surface 
fulvous to fuliginous, concentrically and radially rimose, especially in 
age, the separated areas imbricated; margin very obtuse, concolor- 
ous, context corky, concentrically banded, fulvous to umbrinous, 
very thin, only one-tenth the length of the tubes in thickness; tubes 
3 em. long, 2-3 to a mm., tawny chestnut, polygonal, edges thin, entire; 
spores ovoid, smooth, very dark brown, 1-2 guttulate, 8 x 10u.” 
While this description was made from one specimen, the 
characterization is a good one and well defines the sporophores 
recently collected, and now in the herbarium of the Missouri 
Botanical Garden. One of the marked characters of the fruit- 
ing structure is the concentrically and radially rimose surface 
(pl. 7 figs. 1, 2) with imbricated areas, particularly in the older 
specimens. The tubes are very long, 2-35 cm. (as stated by 
Murrill), and make up the larger part of the mass of the sporo- 
phore. The largest specimen found measured 9.5 ст. in width, 
7 em. in length, and 5 em. in thickness. Using Ridgeway's 
color scale, the top is avellaneous gray, the tubes tawny, the 
substance antique brown (umbrinus of Saccardo’s scale); near 
the margin the color is verona brown to warm sepia. Murrill's 
statement that the sporophore is attached by the vertex should 
be amplified, as many of the sporophores are practically dimidi- 
ate. With the additional material now available for study, the 
modified description of the fungus in question is as follows: 
Polyporus texanus (Murrill) Saec. & Trott. Syll. Fung. 21: 
272. 1912. 
Inonotus texanus Murrill, Bull. Torr. Bot. Club 31:597. 1905. 
Pileus ungulate, attached by the vertex or dimidiate, 4-9.5 
ста. wide, 3-7 em. long, and 4-5 em. thick; surface avellaneous 
gray to fulvous, concentrically and radially rimose, especially 
in age, the separated areas imbricated; margin very obtuse, 
verona brown to warm sepia; context corky, concentrically 
banded, antique brown, very thin, only one-tenth the length of 
the tubes in thickness; tubes 2-31 cm. long, 2-3 to a mm., tawny, 
polygonal, edges thin, entire; spores ovoid, smooth, very dark 
brown, 1-2guttulate, 8x104. Parasitic on living mesquite trees. 
