2O TROPICAL POLYPORES 



Tubes short, about equal to the thickness 



of the context. 

 Hymenium subfulvous; spores ovoid, 



3-4 M- 14- T. fulvitinclus. 



Hymenium white to pallid; spores 



cylindric, 4X1 M. 15. T. duracinus. 



I. TYROMYCES PALUSTRIS (Berk. & Curt.) Murrill 



Pileus dimidiate, convex above, plane or concave below, 

 much thicker behind, subimbricate, fleshy- tough to rigid and 

 somewhat friable when dry, 4-6 X 8-10 X 1-3 cm.; surface 

 smooth, glabrous, white to slightly yellowish, sometimes rough 

 and tubercular behind ; margin thin or thick, entire or undulate, 

 white, becoming slightly discolored; context 1-2 cm. thick, 

 white, fleshy-fibrous when fresh, becoming firm and somewhat 

 friable when dry; tubes 2-5 mm. long, white to slightly yellowish 

 within, about 4 to a mm., edges thin, white to yellowish, entire 

 to dentate. 



Occasional on pine trunks in southern Florida, the Bahamas, 

 and Cuba. 



2. TYROMYCES PALM ARUM Murrill 



Pileus very broad, thin, applanate, dimidiate, concave below, 

 incurved on drying, fleshy-tough to rigid, 6-10 X 10-20 X 0.5- 

 0.8 cm.; surface glabrous, nearly smooth, slightly rugose or 

 tubercular, white to cremeous; margin thin, undulate to lobed, 

 fertile, concolorous; context white, fleshy-fibrous to rigid and 

 somewhat fragile on drying, 3-5 mm. thick; tubes 2-4 mm. 

 long, white to yellowish within, mouths glistening, angular, 

 regular, 3 to a mm., white to slightly yellowish and finally 

 avellaneous, edges thin, entire; spores globose, 3 /x. 



Found a few times on dead palm logs in Cuba and Jamaica. 



3. TYROMYCES NIVOSELLUS Murrill 



Pileus simple, imbricate, dimidiate, semicampanulate to un- 

 gulate, very thick behind, convex above, concave below, 3-5 X 

 6-9 X 2-4 cm.; surface smooth, glabrous, azonate, white or 

 very slightly yellowish; margin thick, usually obtuse, entire or 

 undulate, concolorous, darker when dry; context fleshy- tough, 

 rigid, but slightly friable when dry, milk-white, 0.5-2.5 cm. thick; 

 tubes long and slender, about I cm., white to dull-yellowish 

 within, mouths regular, angular, 3 to a mm., white to isabelline 

 or umbrinous, edges firm, rather thin, entire; spores ellipsoid, 

 3-5 X6/*. 



Found a few times on palm trunks in Cuba and Porto Rico. 



