5O TROPICAL POLYPORES 



larger near the margin, most of them about 3 to a mm., glistening, 

 stramineous, edges thin, entire; spores ovoid, 5-6 X 2-3 /*; stipe 

 obsolete. 



Collected once in Troy and Tyre, Jamaica, on a log in woods. 



16. ABORTIPORUS Murrill 



Hymenophore annual, tough, humus-loving; stipe normally 

 central, often obsolete; context yellowish-white, duplex, spongy 

 above, woody below, tubes thin- walled, mouths polygonal; 

 spores smooth, hyaline. 



Pileus circular, 6-13 cm. broad. i. A. distortus. 



Pileus spatulate to reniform, 2-3 cm. broad. 2. A. tropicalis. 



i. ABORTIPORUS DISTORTUS (Schw.) Murrill 



Pileus normally thin, plane or depressed, circular and centrally 

 stipitate when properly developed, but often aborted and very 

 irregular, varying to entirely resupinate forms, 6-13 cm. in 

 diameter, 0.3-1 cm. thick; surface conspicuously and compactly 

 tomentose, anoderm, azonate, smooth, white to alutaceous; 

 margin thin, undulate to lobed, concolorous; context soft and 

 spongy above, hard and woody below, white or isabelline, 3-5 

 mm. thick; tubes annual, decurrent, white, 1-5 mm. long, mouths 

 irregular, variable, 2-3 to a mm., edges thin, entire to dentate; 

 spores subglobose, 5-7 /* long; stipe central, unequal, very vari- 

 able, often obsolete, resembling the pileus in surface and context. 



Found twice in Porto Rico, once in the perfect form and once 

 in the aborted condition. It usually occurs about stumps and 

 buried wood of broad-leaved trees. 



2. ABORTIPORUS TROPICALIS Murrill 



Pileus distorted, spatulate to reniform, laterally stipitate, 

 tough, flexible, becoming almost rigid when dry, 1-2 X 2.5-3 X 

 0.2-0.4 cm.; surface spongy, finely tomentose, uneven, plane or 

 depressed, rosy-ochraceous, anoderm; margin white, becoming 

 reddish-brown when bruised, undulate to lobed, sterile; context 

 white, duplex, with a firmer layer next to the tubes ; tubes short, 

 white within, mouths minute, invisible to the unaided eye, 

 somewhat glistening, white, edges firm, obtuse to subacute, entire; 

 spores globose, smooth, thin-walled, hyaline, copious, 4.5-6^; 

 stipe ascending, expanding into the pileus, sometimes branched 

 at the base, very irregular, cremeous, clothed like the pileus, 

 tapering below, about 3 cm. long and 5-10 mm. thick. 



