ACOTYLEDONS. LICHENS. Collema. 71 



* Thdllus hnbricatcd, pliaded, suhoilncular, composed of minute lobes 

 {when mohi, tli'uk and tiirL;'ul). (Euchylium.) 



1. C. cheileum, thallus suborbicular imbricated, lobes thick all 

 ' minute rounded cienuluted ascending, apothecia nearly plane 



aggregated of the same colour as the thallus the margin crcnu- 

 latcd subevanesccnt. Acli, Syn. Lick. p. 310. Lichen mar- 

 giiiatus, Bcrnh. in Schrnd. Jouni. 1709, v. \.p. 6. /, 1 .J'. 2. a. 

 Dicks. Cnjpt.fasc. 4. p. 25. 

 Hab. Roots of trees in shady subalpine woods, Dickson. 



2. C. Jiielcenum, thallus orbicular somewhat stellated imbricated, 

 lobes cut and laciniated their margins elevated waved crisped 

 and crenulated, apothecia marginal nearly plane of the same 

 colour with the thallus their margin granulated, yich. Syn. 

 Lick. p. 315. 



/3. margina/e, lobes of the thallus deeply laciniated narrow multi- 

 fid spreading flexuose nearly plane crenatc and lobed, apothecia 

 marginal and scattered dark brown their margin entire, yich. 

 Si/7i. Lick. p. 316. Lichen marginalise E. B. t. 1U21. 



Hab. p. Highlands of .Scotland, Sir J. E. Smilh, in E. B. 



3. C. fusciculare, thallus suborbicular imbricato-plicate, plaits 

 central erect flexuose, lobes of the circumference rounded in- 

 ciso-crenate, apothecia marginal turbinate fasciculate, disk 

 rather convex reddish. Ack. Si/n. Lick. p. 317. Lichen fascic , 

 Lightf.p.SAl.E.B.tAWl. 



Hab. Shady places on the north sides of trunks of trees, not iinfre- 

 quent, particularly on the ash, Dr. Burscss. Wood between Bal- 

 laclieulish and Linnhe Loch, Mr. Turner and Hook. 

 •A-* Thalliia foUaceous ; lobes rounded, doicnij or Jibriilose beneath. 

 (Mailotium.) 



4. C. salurni/mm, tliallus foliaceous bluckisii green glaucous and 

 downy beneath, lobes rounded waved entire, apothecia scat- 

 tered elevated j)lane reddish their margin entire. Ack. Si/n. 

 Lick. p. 320. Lichen sutarninus, E. B. I. 1980. 



Hab. Trunks of trees, Dickson. 



5. C. Burgesni, thallus foliaceous somewhat imbricated glaucous 

 greenish brown joubcscent and somev,hat sj)ongy beneath, lobes 

 rounded sinuated crenulated and crisjicd, apothecia deiiicssed 

 planish brown their margin foliaceous crisped. Ack. Syn. 

 Lick. p. 320. Lichen Burges^'i, Ligklf. p. 827. E. B. t. 300. 



Hab. Discovered upon trunks of hazel and binh in Dumfries-shire 

 by -Dr. Burgess. Plentiful on trees by the side of Loch Lomond, 

 going to Tarbet 3 and near Inverary and Ballacheulish_, 3/?-. Turner 

 and Hook. 



*** Thallus foliaceous j lobes submembranaceous, lax, naked, b'adkish 

 green. (Lathagrium) . 



6. C. nigrescens, thallus foliaceous membranaceous submono-r 

 j*Iiyl!ou5 oibicuhi) dcprci-^ed plaited rounded and lobed black- 



