ki:pokt of t]ik statk i-.otanist 1917 93 



3 to 4 to a millimeter. The walls of the tubes are very thin but 

 entire. There is no sheen or silkiness to the hymcnium. 



Spores have not certainly been found in the type collection. One 

 preparation yielded a few cylindric spores that were colorless and 

 measure 4 to 5 /* in length and about i /a in breadth (plate 11, 

 figure 2). Most collections of Poria in this section, in the writer's 

 herbarium have this type of spore and it is probably the kind to be 

 expected in this plant. There are no cystidia in the hymenium 

 (plate II, figure i). The trama and subiculum are of quite com- 

 pactly arranged hyphae that are colorless, rarely branched in the 

 subiculum but more frequently so in the trama, and with few clamp 

 connections. Cross walls are rarely seen except in company with 

 the clamp connections. In the subiculum many of these hyphae are 

 encrusted and vary in diameter from 2.5 to 5 /x (plate 11, figure 3). 

 Those of the trama are more often unencrusted, and somewhat 

 smaller, with a diameter of 2 to 3.5 /a (plate 11, figure 4). 



The type collection differs from P. m u t a n s in the following 

 characteristics. It is much thinner; the colors of the dried plants 

 are quite different ; their consistency is not at all that of P . 

 m u t a n s ; that is, not hard and bony on drying. The hymenial 

 characters with the possible exception of the spores are the same 

 as those of that species. 



The t>^e collection is apparently from bark and decorticated 

 wood of spruce. The decayed wood is straw yellow in color, quite 

 brittle and readily separates into concentric layers. One specimen 

 shows advanced stages of a pocket or piped type of decay but 

 another organism may be responsible for it. 



Rcdescription. Annual, separable, efifused for 10 to 12 cm or 

 more, with a compactly tomentose, sterile margin i cm or more 

 broad, vinaceous cinnamon in color ; subiculum quite thin but con- 

 spicuous under a lens ; tubes scarcely .5 mm long, their mouths 

 yellowish or subochraceous when fresh (fide Peck), vinaceous 

 cinnamon, onion-skin pink, or much darker (near burnt umber 

 or carob brown) in dried plants, angular, thin-walled, entire, aver- 

 aging 3 to 4 to a millimeter; spores not definitely known, probably 

 cylindric or allantoid, hyaline, 4 to 5x1 /*•; cystidia none ; trama 

 and subiculum compact, of hyaline, thin-walled, simple or slightly 

 branched hyphae, often heavily encrusted in the subiculum, but less 

 so in the trama, 2.5 to 5 ju, in the former, 2 to 3.5 /x in the latter; 

 cross walls mostly inconspicuous ; clamp connections present but 

 not abundant. 



