Spihma.} LICHENES. W 



10. S. gregdrium, Turn, and Borr. (jed clustered Spiloma); 

 crust filmy thin greyish, apothecia clustered shapeless solid of 

 a livid hue, sporules vermillion-coloured superficial. Turn, and 

 Borr. Lick. Br. p. 42, — x. cinnabarinum ; apothecia somewhat 

 convex covered with a profusion of vermillion-coloured sporules. 

 Coniocarpum cinnabarinum, De Cand. — Splieria gregana, 

 « Weigel. 43. t. 2./. 1 0." Dicks. Cr. Fasc. t. 22. Sower, Br. Fung. 



t. 375./. 5 Spiloma tumidulum, Ach. Sgn. p. 1. E. But. 



t. 2151.— Lichen impolitic, E.Bot.t.9S].—[3. rosaceum ; apo- 

 thecia collected into flat clusters which have the appearance of 

 being lobed, sporules copious vermillion-coloured. — y. margi- 

 natum ; apothecia somewhat convex party-coloured, sporules 

 few chiefly confined to the margin. — b. coucolor ; apothecia con- 

 vex of nearly the same colour as the crust, sporules scarcely 

 any. — e. dubium ; apothecia rather convex lurid pruinose, spo- 

 rules none.— £. detritum ; apothecia depressed lurid nearly 

 naked, sporules none. — n. nv'crostigma; apothecia minute solitary 

 depressed covered with a whitish pruina, sporules none. 



a. and y. are common on bark, chiefly on smooth trees. — /J. on old 

 Oak on Poynings Common, Sussex— S. and *. grow on Oak and 

 Ash.— ?, chiefly on Hazel— n. on Ash in shady places — " The large 

 size of the compact base or internal disk of the pulvinuli, sufficiently dis- 

 tinguishes the present plant, through all its variations, from its con- 

 geners; as in every other Spiloma, hitherto detected, S. punctalum alone 

 excepted, this part, if present at all, is very minute and entirely con- 

 cealed by the sporules." The two last varieties t. and I bear a close 

 resemblance to Artbonia impo/ita ; but the thallus of the Arthonia is 

 stated to be always thicker and more uneven, and its apothecia, though 

 larger, are generally less conspicuous than those of the Spiloma, being 

 scarcely, if at all, elevated above the level of the thallus: their internal 

 substance likewise is very different, presenting a more waxy appearance 

 when cut. 



11. S.? tuberculatum, 8m. (warty Spiloma); crust calcareous 



greyish-white, apothecia scattered somewhat confluent unequal 



elevated granulated black. E. Bof. /. 2556. Schorr. Licit. 

 Helv. 1 1. 2. a. .'). 



On sandstone rocks, in the neighbourhood of Newcastle. — Mr. Homer 

 consider* the thallus to be probably that of some Lecidea. 



Obs.— The Spiloma meUmopum o( Sm. in E. Bot. t. 2358, described 

 i|s having "the crust verj thin greyish, apothecia Bat dilated irregular 

 somewhat confluent black," and communicated by Mr. Borrer to Sir Jas. 

 I Smith, is now considered to be a doubtful production, being mixed 

 with comparatively large jointed filaments, probably belonging to some 

 Confi rva or filamentous Fungus. The Spiloma wulanopum of Ach. M<th. 

 JK |0, /. i. r. ;{., to which il \i referred, seems to be something wery dif- 

 ferent, as far as can be judged from the description and figure, and is 

 indeed now, bj Acharius himself, stated to be formed* ofhi 

 melanthcra, upon a stratum of his Lepraria alra, Lich. Vuw. I L 

 welanopa, of the Syn ) 



