Boletus.l rUNGI. 147 



On decaying wood at the bottom of posts ; sometimes spreading 

 over leaves. — Effused sometimes to the breadth of a foot, smooth, not 

 a line thick, nor to be separated from the wood without destroying it, 

 margin when young very slightly pubescent. Pores straight or oblique, 

 roundish. Tlie fii^ures at the bottom of Bolton's plate appear to 

 belong to Thelephora Avellana. 



43. P. Vaillchitii, DC. ( Vaillant's Poli/porus); effused byssoid 

 costate whitish, pores rather large irregularly disposed in heaps 

 often oblong and irregular. Vaill. Bot. Par, p. 41. t. 8. f. I. 

 ^P. Vuillantii, Fr. Syst. iMi/c. v. \. p. 383. El. v. 1. p. 122. 



Bol. Vaillaniii, Pec. PL Fr, t. 6. p. 38. — B. medulla imnis^ 



Sow. t. 326. 



Ou fallen trunks and on the ground : Sowerhj. Glasgow Botanic 

 Garden, Klotzsch in Iloolt. Herb. — " Forming a thin, white or slightly 

 rufesccnt, byssoid, broadly effused close, membrane, here and there tra- 

 versed by rooting ribs." Fr. I. c. 



44. P. molhiscusy Pers. (^soft prostrate Polyporus) ; effused 

 thin soft white, the circumference iibrillose, pores slender un- 

 equal. Fr. Syst. Myc. v. 1. p. 384 Bol. latus, Soic. t. 887. 



/.9. 



On stumps, branches, rotten leaves, &c — At first forming a mere 

 fringed byssoid membrane, which gradually acquires moderate rigid 

 subrotund and angular pores, the partitions of which are so thin that 

 they very generally become lacerated. 



45. P. Armeniacus, Berk, (hitff and white Folyporm) ; sub- 

 orbicular confluent extremely thin, circumference minutely- 

 downy, pores at first white then deep-buff. 



On the bark of fir-trees ; Captain Carmichael. — Forming broadly 

 effused [)atches, composed evidently of many confluent orbicular indi- 

 viduals ; circumference minutely downy. Pores shallow, minute, nearly 

 round, at first white then bright buff", often confined to the centre, the 

 marginal portion being of a byssoid structure under a lens. This most 

 eleuant and apparently distinct species was marked by Captain Car- 

 michael as Polyporns Radula, b. V irg incus ; but as it does not accord 

 with that species, and the specimens arc remarkably perfect, I feel 

 myselfjustified in proposiug it as new. Another species occurs in the 

 same collection, marked Pohjporus vuhjaris, and aj)parently altogether 

 distinct ; but as there is only a single specimen and there are no very 

 prominent characters, it is perhaps better to omit it. 



7. Boletus. Bill. Boletus. 



llymcnltim distinct from the substance of the pilous, consist- 

 ing of cylindric separal)Ie tubes. Sjwrulcs oblong. — Name; 

 from /5w>o;, a bull ; from tiie riuinded form of many of tln'in. 



1. B. liUcus, L. (dinf/y yelloiv Bolttus) ; pileus dingy-yellow 

 clothed with brown sliu»e which gradually disappears, tubes 

 adnate dull-yellow, stem furnislied with a ring, dotted al)ove. 

 Linu. Slice. 1247. ScUj)'. t. 1 14. Fr. Syst. Myc. v. \. p. ^J8G. 



