262 



UCHENACBI. 



[PARMELIA. 



n. 1513. Parmclia terehrata (HofFm.), ^Mudd, Man. p. 97. Parmdia 

 diatriipa Hook. Fl. Scot. ii. p. 56 ; 8m. Eng. Fl. v. p. 204 ; Tayl. 

 in Mack. Fl. Hib. ii. p. 150. Physcia diatri/jja Gray, Nat. Arr. 

 i. p. 436. Lichen diatrijpus Sm. Eng. Bot. t. 1248.— 5?-if. Exs. : 

 Leight. n. 264 ; Larb. Caesar, n. 66 ; Cromb. n. 145. 



In general appearance like small states of P. physodes, from which, 

 apart fi-om the chemical reaction of the medulla and the number of the 

 spores, the pecidiar perforations in the lacinia^ at once distinguish it. 

 The thallus is usually sprinkled with round whitish soredia (form 

 sorediohola Xvl.). In this country it has not occurred fertile. The sper- 

 moo-ones, which are very seldom present in our specimens, are as in 

 P. physodes. 



Hah. On rocks among mosses and on the trunks of trees in maritime 

 and upland districts. — Listr. Local in the Channel Islands, S.AV. Eng- 

 land, N. Wales, S. Scotland and the W. Highlands, in S.W. and N. 

 Ireland. — Ii. M. : Bonne Nuit, Island of Jersey. New Forest, Hants; 

 Bolt Head and Valley of Rocks, Lynton, Devonshire ; near Penzance and 

 Treo-awn, Cornwall ;" Barmouth and Dolgelly, Merionethshire ; foot of 

 Snowdon, Carnarvonshire. New Galloway, Ivirkcudbrightshu-e ; Bal- 

 lachulish, Aro-vleshire. Pass of Keim-an-Eigh, co. Cork ; Glenmore Lake 

 and Dunken-on, co. Kerry ; Coimemara, co. Galway ; Cushendun, co. 

 Antrim. 



43. PARMELIOPSIS Nyl. 

 Lich. Scand. (1861) p. 105 (ut 

 sectio Parmelise) ; Not. Siillsk. 

 pro F. et Fl. Fenn. Forh. 

 n. ser. v. (1866) p. 121. — 

 Thallus small, thin, apprcssed, 

 stellate ; beneath sparingly 

 iibrilloso-rhizinose. Apothe- 

 cia small, parmelioid ; para- 

 physes not discrete ; spores 

 Snse, simple, more or less 

 ellipsoid, colourless : hyme- 

 nial gelatine bluish with 

 iodine. Spermogones scat- 

 tered, at length slightly pro- 

 minent : sterigmata short, 

 simple ; spermatia long, aci- 

 cular, arcuate. 



A small genus separated from 

 Parmclia on account of its 

 spermatia, which are like those 

 of Sqitamaria in the Lecanorei, 

 but the thalius shows that it 

 belongs to tliis tribe. Two of 

 its three European species dccur 

 sparingly in Great Britain. 



(• WC-S. ss. 



fig. 4.'). 

 Parmdiopsis amhigxa Nyl. — a. Vertical 

 section of a young portion of thallus, 

 with a rhizina beneath, X 200. h. Ver- 

 tical section of an apotheciuni, x30. c. 

 A tiieca, X.'JAO. cl. Spore.^. xalK.). c. 

 Vertical section of tlialhis uitli a spernio- 

 gone (on the loll beneiith, a rhizina), 

 XiJO. /. Sterigmata and spermatia, X600. 



