56 ACOTYLEDONS. — LICHENS. Borvcra. 



rather convex cut multifitl, apotliecia glaucous black their mar- 

 gin entire at length waved and crcnate. Ach. St/fi. Lich. 

 p. 216. Lichen stellaris, Lighlf. p. 824. E. B. t. 1697. 



Hab. Trunks of trees, common. 



** With the segments of the thallus inflated at the extremity (Physcia) , 



25. P. physodes, thallus substellated glaucous white, beneath 

 brownish black, the segments sinuato-multifid convex glabrous 

 inflated and ascending at the extremity, apothecia red brown 

 their margin entire. Ach, Syn. Lich. p. 218. Lichen phy- 

 sodes, E.B.t.UG. 



Hab. Rocks, on the Pentland Hills, Maiigh. Cathkin Hills, plentiful, 

 Hopk. 



The fruit is very rare. Besides the true apothecia, there are often 

 pedunculated whitish powdery warts. 



22. P. diatrypa, thallus substellate greyish green, beneath rugose 

 blackish and white, the segments j«inuato-n)ultihd nearly plane 

 smooth bearing powdery warts and perforated, the extremities 

 inflated, apothecia reddish their margin entire. Ach. Syn. 

 Lich. p. 219. Lichen diatrypus, E. B. t. 1248. 



Hab. AA^et rocks among moss, rare. At Balacheulish, bearing fructi- 

 fication. 



18. BORRERA. 



Universal receptacle cartilaginous, branched and laciniated, the 

 segments free, generally channelled beneath, and the margins 

 ciliated. Partial recept. scutelliform, thick, formed of the 

 thallus beneath, its disk coloured and surrounded by the ele- 

 vated and inflexed margin formed also of the thallus. 



1 . B. Ciliaris, thallus glaucous green the segments linear branched 

 attenuated ciliated especially towards the apices beneath 

 whitish and channelled, apothecia mostly terminal their disk 

 concave at length plane blackish brown glaucous, the margin 

 crenate and fimbriated. Ach. Syn. Lich. p. 221. Lichen 

 ciliaris, Lighlf. p. 828. E. B. t. 1352. 



Hab. Trunks of trees, frequent. 



2. B. tenella, thallus greyish white naked on both sides and of 

 the same colour substellated, the segments pinnatifid ascend- 

 ing dilated arched and ciliated at the extremity, apothecia 

 scattered, the disk plane caesious black its margin entire. 

 Ach. Syn. Lich. p. 221. Lichen tenelluSj E. B. t. 1351. 

 Lichen ciliaris, /3. Lighlf. p. 828. 



Hab. On the branches of trees. 



3. B.furfiiracea, thallus greenish grey farinaceous the segments 

 linear attenuated branched grooved naked rugose and blackish 

 beneath, apothecia somewhat marginal cup-shaped with their 

 margin thin inflexed. Ach. Syn. Lich. p. 222. Lichen fur- 



furaceus, Lighifp. 832. E. B. t. 984. 



