Squamaria.] LICHENES. 193 



Old pales and in the inside of old hollow trees, Suffolk, &c. On trees 

 and rocks, Scotland, Mr. Dickson. 



4. P. decipiens, Hoffm. (deceitful Psora); thallus subimbri- 

 cated with separate roundish rather broader concave lobes or 

 scales flesh-coloured or red white at the margin at length brown, 

 apotheeia small marginal convex or subglobose, the border ob- 

 solete. — Lecidea decipiens } Ach. Syn. p. 52. — Lichen decipiens, 

 IIuhc.—E. Bot. t. 870. 



On the Gogmagog hills, Cambridgeshire Mountains of Scotland, 

 frequent among rocks. 



5. P. glebulosa, (broken-crusted brown-shielded Psora); thallus 

 distinct imbricated witli minutely lobed glaucous-white tumid 

 adherent scales, apotheeia convex deep red-brown with a thm 

 entire border — Lichen r/lebidosus, E. Bot. t. 1955.— L. testacy's, 

 " Winch, Quid. v. 2. p. 42"— Lecidea pholidiota, Ach. Syn. 

 p. 53. 



On quartzose rocks at Lanchester, and walls at Knitsby, Durham, 

 Mr. Winch. 



6. P? rubifdrmis, f Raspberry-fruited Psora); thallus depres- 

 sed of somewhat crustaceous rounded lobed crenate light-green 

 lobes or scales thickened and pale at their margins white be- 

 neath, apotheeia oil the disk clustered sessile minute ulobose 



hollow red. Sui /Jehu/ rubifon/iis, Wahl. — E. Bot. t. '2\\'2 



Batomyces rubiformis, A<h. JJeth. p. 324. t. 1 . f. b^—Cenomyce 

 rubify Licit. Univ. — Lecidea rirfnformis, Ach. Syn. p. 52. 



On turfy earth near Uipon, Yorkshire, Mr. IV. llrunton. — This singu- 

 lar production 1 know only from fmurcs and description. The fronds 

 resemble the crust of some Scyphopharvjs : the fruit is like nothing among 

 any Genus of Lichens. 



16. Squamaria. (Squamaria and part of Placodium, De Cand.) 



Spiamaria. 



Thallus defined, scaly, ^reading, orbicular and stellate, ihe 



scales di-t'mct w adherent, often Rubricated, diverging. \po- 

 tlicaa { putt liul,, ) bordered; sessile, the border oV the same -ul»- 

 Btance as the thallus. — Named from gqttdtna, a scale, the thallus 

 of several species being formed of scales moreoi'less combined. — 

 TJaisraay be considered an i uienued hit e link between tie /,,, ,nn>r„ 



and the PofWelia ; mOSl allied, huwrv^r. lo the latter, but 

 having- a much le-- dUlinctly leafs or ineinbrauai £01|S thallu-. 



* Thalhis imbricated. 



1. S« f/v/.Nw/, l>e ('and. (Ihiil Sipn unarm); t liallu- inibri. at. d 



thick cartilaginous greyish-green it- (obes or scales spreading 

 imbricated Jobed and waved brownisb beneath, apotheeia nattish 

 brotmish-orange with an elevated border. /■■ 



.Hi. Si/n. r . MMt. Lichen U E. Bot. t 1893.— 



I.}* It, ,, iiirtilat/'iiii us. Lightf Dicfts, Dill ] l c. t, ' ' f.74. 

 I > limestone r 



