Polyporus POLYPORACE.E 343 



1553. P. eerebrinus B. & Br. (from its brain-like appearance ; 



cerebrum, the brain) a b. White. 

 P. pulvinate, delicately tomentose, then smooth; marg. crenate. 

 T. rounded, entire, dissepiments of the large Po. thick, obtuse. 

 Fir. Aug. P. 1 in. Resupinate ; not unlike 1657. 



1554. P. laeteus Fr. (from the milk-white colour ; lac, milk) a c. 



White. 



P. 1-3 connate, gibbous, thick, flesh-fibrous, pubescent, zoneless. 



T. long. Po. toothed, at length labyrinthiform and torn. 



Imbricato-connate. Taste astringent ; odour none. Dead bark, leaves, 

 laburnum, birch, beech ; rare. Sept. -Nov. P. 3 in. 



1555. P. fragllis Fr. (from its fragile substance) a b c. 



P. convex to piano-depressed, rugose, thick, whitish, pale foxy-red 

 where bruised. T. long. Po. minute, intricate, colour as P. 



Single to 7-imbricate. Stumps and branches, pine, covering moss on pine- 

 bark, larch ; uncommon. Sept. -Nov. P. 2j in. 



1556. P. mollis Fr. (from its softness ; mollis, soft) a c. 



P. effuso-reflexed, rugose, fleshy fibrous, pale flesh-colour, livid or 

 brownish-biscuit, sometimes slightly zoned darker ; marg. 

 acute, foxy where bruised. T. long, unequal, soft, white or 

 salmon-white, foxy where bruised. 



Single to 3-imbricate, or connate. Dead pine. Sept. P. i\ in. 



1557. P. esesius Fr. (from its bluish-grey clouding ; ccesius, bluish- 



grey) a b c. Ivory-white, becoming pale turquoise or bluish- 

 grey where bruised. 

 P. thick, fleshy, lobed, unequal, silky. T. long. Po. torn into 

 teeth. 



Single to 3-imbricate or connate. Dead fir, larch, dead fir-leaves, roots, 

 trunks, posts, sticks. Mar. -Nov. P. 4^ in. 



1558. P. trabeus Rostk. (from its frequent habitat, the wood of 



ships ; trabs, timber) a c. White. 



P. thick, firm, efTuso-refiexed, transversely elongate, zoneless, 



pallid. T. short. Po. minute, toothed. Flesh hyaline when 



moist. 



Single. Wood, yew, pine. Oct. P. 3f in. Commonly confounded with 

 1559, from which it is distinguished by being more regular and brighter in 

 colour. 



1559. P. destructor Fr. (from its destructive effect on wood) a b c. 



Ivory-white. 



P. watery-fleshy, rugose ; marg. pale brownish. Po. toothed or 



torn. 



Connato-imbricate. Worked wood, which it softens and destroys, stumps, 

 branches, fir, larch, fir-leaves, willow ; common. May-Dec. P. 3§ in. 

 Var. undulatus Sacc. Broadly expanded, marginate, pale foxy-brown. 

 Ceriomyces {Ptychogaster) albus (fig. 77) is very commonly associated with 

 this species and 1572. Berkeley considers Ptychogaster to be an imperfect 

 conidial state of one or both of these Polypores, whilst others regard it as a 

 parasite. It has also been made a species of Polyporus, viz. P. Ptychogaster 



