Ord. VIII. Tribe I. LICHENS IDIOTHALAMI. 
955 
15428 Crust thin leprose powdery soft pale green.-yellow, Apothecia slightly convex pale yellowish : marg. obsol. 
15429 Crust thin effuse somew. granul. black, Apothecia min. cluster, flat yellow, with an elevat. ent. paler marg. 
15430 Crust thin smooth, white, Apoth. crowd, at length convex hemispher. margin, orange-color, white within 
ft Thallus crustaceous, of a regular figure or leaf. Lepidoma. 
15431 Crust somewhat imbricated white hoary. Lobes crenate reflexed tumid, Apothecia appressed black 
glaucous ; edge finally wavy 
15432 Crust somewhat imbricated brownish-black covered with a greyish powder. Lobes entire swelling, 
Apothecia black naked, at length hemispherical with the margin obsolete 
15433 Crust imbricat. green.-brown, Lobes round, cren. paler ben. Apothecia plane, at length somew. conv. black 
15434 Crust somewhat contiguous lobed areolate and imbricated cinereous brownish-lurid. Lobes becoming 
flexuose cut-crenate, Apothecia appressed not edged flattish finally confluent 
15435 Crust imbricated pale olive-green, Lobes distinct reniform nearly erect beneath and the margin powdery, 
Apothecia plane margined glaucous black 
15436 Crust indeterminate very tliin fibrous black with white convex crowded smooth warts, Apothecia solitary 
in each wart depressed coal-black with a border of the same color 
15437 Crust somewhat imbricated. Lobes rounded crenate livid-brownish white beneath surrounding the 
apothecia, which are hemispherical clustered reddish not margined 
15438 Crust subimbricated. Lobes distinct subpeltate roundish flesh-colored and red brown whitish beneath, 
Apothecia in their border convex and subglobose black : margin obsolete 
15439 Crust imbricated glaucous white, Lobes minute rounded convex, Apothecia convex rufous brown be- 
coming blackish : margin thin entire 
15440 Thallus slightly imbricated fragmentary grey.-green on a dense black fibrous cushion : its segm. somewhat 
linear lobed crenate and granular at the margin, Apothecia scattered tawny paler atthe.marg. at length 
convex brown obliterating the margin 
15441 Crust orbicul. rugose plait, hoary lobed-plait. in circumfer. Apothecia central plano-convex dark-colored 
15442 Closely imbricated radiated membranous very smooth brownish-grey pale with black fibres below : its 
segments linear obtuse undulated, Apothecia black with a black border of their own substance 
15443 Crust areolated-warted smoothish wavy, Apothecia sessile dark opaque, Disk flat tumid at edge 
15444 Crust somewhat contiguous unequal whitish or none, Apothecia sessile subglobose dark smooth : disk 
dot-like becoming flattish with a thin shining margin 
15445 Crust somewhat tartareous contiguous wrinkled olive-green, Apothecia roundish dark shining : disk 
depressed opaque, and stalks short whole-colored 
15440 Crust effused greyish somewhat pulverulent : fructification subglobose, at length flattened greyish-black 
with a cylindrical thickish-black peduncle 
15447 Crust very thin grey, smooth, Apothecia subglob. : disk dark-brown ; margin greyish. Stripes filif. black 
15448 Crust cartilaginous areolate rugose smooth yellow-green, Apothecia lentiforra ferruginous powdery. 
Stems short cylindrical dark-pitch color thicker at base 
15449 Crust lemon-yellow granulated and conglomerated : fructification subturbinate ; disk brown convex, the 
border yellow and pulverulent, Peduncle filiform blackish and shining at the base 
15450 Crust thin white ash-color. Apothe. becom. lentif. : disk black.-brown ciner. pruin. vv ith a yell. -green marg. 
15451 Crust thin whitish powdery, Apothecia lentiform : disk flesh-colored becoming brown powdered. Stalks 
filiform naked pale becoming brownish or black 
15452 Crust effuse powdery greenish-yellow, Apothecia globose, and stalks filif very long flexuose yellow. -green 
15453 Crust leprous i)owdery pale yellowish-green, Apothecia hemispherical globose and stalks tapering up- 
wards straight powdered with fulvous 
15454 Crust thin granulated tartareous rusty white, Apothecia on short stalks thick black often compound 
with a pale rusty disk 
15455 Crust white granulat. Tuber, a little prominent round flatt. gray.-black powdery with a smooth black edge 
Crust granulated smooth greyish-white. Tubercles scattered roundish black polished v/rinkled irregular 
without a border mostly sessile 
1.'5457 Crust membran. very thin white. Tuber, black convex with recurv. marg. on long slend. wavy black stalks 
l.WSS Crust thin tartareous somewhat granulated of a verdigrease-grey, Apothecia on slender black stalks 
black hemispherical with a convex brownish-black disk 
15459 Crust filmy very thin whitish, Apothecia on thickish black stalks obovate or hemispherical black with 
black prominent loose powder 
15460 Thallus smooth blackish-green : ben. smooth black and naked, Apothecia at length conv. rough and plait. 
/3 Thallus of many Ivs. or lobes variously fold, black. -green quite black ben. on each side naked and smooth. 
15461 Thallus membranaceous with elevated reticulations, at length of a smoky ash-color rough smoother paler 
and subfibrillose beneath, Apothecia turbinate, at length convex variously plaited 
,3 Thallus thick hard rigid with elevated dots rugose olive-brown becoming black naked smooth pale- 
yellow beneath, Apothecia globose " _ 
15462 Thallus somewhat naked dark greenish-grey folded and lobed strongly ciliated beneath smooth pale with 
branching fibres, Apothecia elevated nearly plane with concentric and plaited lines 
and Miscellaneous Particulars. 
complicated, observable in the disk of the i-eceptacles of the shields. The species grow chiefly upon exposed 
alpine rocks, chiefly on granite or volcanic stones. The vitrified forts in the Highlands of Scotland produce 
some of them. 
