CORTICIUM. 



73 





Mycelium and circumference white. 

 Mycelium and circumference coloured. 



III. Leiostroma (Aelos, smooth ; orpco/xa, a stratum). Agglutinated (rarely 

 when mature becoming free), without a strigose or fibrillose circumference. 

 For the mycelium passes at once into the 

 hymenium which is agglutinated to the sub- 

 stratum, but this (the hymenium) occurs of 

 two kinds, one thicker, waxy-soft, fertile ; 

 the other thin and sterile. The most of the 

 species are undistinguished in appearance. 



* Waxy, when fertile facing the ground, 

 uniform, rimose when dry. 



** Amphigenous, turning rigid, circum- 

 ference at first very thinly floccose a7id ra- 

 diating, soon naked. 



*** Amphigenous, at the very first har- 

 dened, somewhat grumous, circumference 

 always naked. 



**** Amphigenous, very thin, innate, re- 

 moving the bark. 



***** Less known species, doubtful. 



Subgenus I. Coniophora (kovls, dust ; 

 4>£pu>; to bear). Pers. Myc. Eur. i. p. 153. 

 Fleshy, undulate and tubercular, rarely 

 membranaceous, becoming even ; hymen- 

 ium smooth, pulverulent with the spores ; 

 in other respects agreeing with Corticiztm. 

 Growing on wood, analogous to the group Co7iiophori of Merulius. 



Subgenus II. Hypochnus {vtto and x v '°vs, the first down on the chin). Fr. 

 Obs. ii. p. 278. Breaking up and becoming floccose or furnished with a 

 tomentose, somewhat pulverulent hymenium. 



* Breaking tip and becoming floccose. 



** Hymenium tomentose, somewhat pulverulent. 



Corticium 



LXXXVIII. Corticium sambuci. 

 Natural size. 



I. — Lomantia. Resupinate, but free at the circumference, &c. 



1. C. evolvens Fr. — Resupinate, marginate or effuso-reflexed, 

 soft, flocculose with whitish down beneath, zoneless. Hymenium 

 naked, smooth, somewhat wrinkled, fuscous becoming pale fuscous, 

 divided in cracks when dry. 



So polymorphous in stature and form, that at first sight the different forms 

 seem scarcely allied. It varies when smaller cup-shaped, marginato-reflexed ; 

 wholly resupinate, broadly effused, immarginate. It is distinguished by the 

 hymenium being soft, somewhat tubercular, very much cracked when dry, 

 fuscous or becoming pale, and by the floccose receptacle. 



On dead wood, especially cherry. Frequent. Oct.-Feb. 



Name — cvolvo, to unroll. Fr. Hym. Eur. p. 646. B. Gt 3 Br. n. 1029. 

 Hbk. n. 921. S. Mycol. Scot. n. 872. 



C. 



2. C. salicinum Fr. — White-villous externally, coriaceous, soft, 

 rigid when dry, persistently cup-shaped, adfixed at the centre. 

 VOL. II. S 



