OV GREAT BRITAIN. 



**** Spores 7-septate. 



409 



22. 0. Leightonii, Crombie in litt. chalky-white, pulverulent; 

 lirellce prominent, rigid, straight or stellato-divergent, tapering 

 towards each extremity ; epithecium at first rimseforin, then dilated ; 

 proper margin thin, elevated; spores 8, colourless, fusiform, 



7-septate (sometimes 5 and 6.) 

 On calcareous and sandstone rocks, frequent. 1807. 



Mr. Crombie has found in Sowerby's Herb, in Brit. Mus. the identical 

 specimen of Opegrapha calcarea from Mr. D. Turner, duly named, localized 

 and marked aa drawn in Eng. Bot. On examination and comparison, it proves 

 to be identical with 0. ChevaUieri, (Leight. Br. Graph, t. 5. f. 4.) having spores 

 broadly clavate, rounded at each extremity, 3-septate. He proposes therefore 

 to name the Opeg. saxatilis, Leight. Br. Graph. Opegrapha Leightonii, Crombie. 



Stn : — 0. saxatilis, Leight. Br. Graph. 9. excl. syn. 0. rimalis septennaria, Nyl. ! 



Fig :— Leight. Br. Graph, t. 5. f . 3. 



Geog. Distrib ;— Europe. 



Bot. Prov;— 1, 2...4, 5...7...10, 11.. .19.. .31. 



England : — Netley Abbey ! Mr. Lyett. Stone Farm rocks, Ardingley ! 

 Sussex. Mr. Borrer. Norfolk and Suffolk. Sir J. E. Smith. Newton Wood ! 

 Cleveland. Mr. Baker. Great Ayton ! Yorkshire. Mr. Dixon. Ilsham ! Tor- 

 quay, Devon. Dr. Dealiin. near Whitburn, Sunderland and Castle Eden, Dur- 

 ham ; Wycliffe Church. Mr. Winch. Castle Barnard, Durham ! Bev. W. Johnson. 

 Aymestry ! Herefordshire. 



Ireland : — Killarney ! Mr. Hardy. 



Wales : — Great Orme's Head ! 



Channel Islands : — La Coupe, Jersey. Mr. Larbalestier. 



Spores .027 — .031 mm. long, .005 mm. broad. 



23. O. lyncea, (Sm.) white, tartareous, pulverulent ; lirellas 

 black, immersed, oblong or lineari-oblong, rounded at each end, 

 simple, curved ; epithecium plane, dilated, cxsio-pruinose ; proper 

 margin stout, elevated, wavy ; spores 8, colourless, fusiform, 

 7-septate. 



On old oaks, not common. 1795. 



Syn :— Smith in E. Bot. 809. (1800.) Leight. Br. Graph. 47. Nyl. Prodr. 151. 

 Mudd Man. 229. 



Fig :-E. Bot. 809. Leight. Br. Graph, t. 7. f. 25. 



Exs :— M. & N. 1158. Bohl. 93. Zw. 422. Nyl. 71. Mudd 204. Leight. 195. 



Geog. Distrib : — Switzerland, Prance, Germany, Sweden, Italy, Brazils. 



Bot. Prov:— 1, 2, 3, 4, 5.. .7, 8...10. 11.. .31. 



England : — Hainault Forest, Essex. Mr. Soweroy. (1795.) near Windsor. Mr. 

 Turner. Sussex ! Mr. Borrer. New Forest ! Hants. Mr. Lyell. Oswestry ! 

 Shropshire. Bev. T. Salwey. on the Bear's Oak ! at Penshurst, Kent. Mr. 

 Thompson. Northamptonshire. Prof. Churchill Babington. Hartshill Wood ! 

 near Atherstone ; Donnington Park ! Leicestershire. Bev. A. Bloxam. Thorndon 

 Hall Park ! Essex. Mr. Piggott. Great Malvern ! Worcestershire. Mr. Lees, 

 Hoggarts Wood ! CHffrigg ! Cleveland. Mr. Mudd. near Bishop Auckland, 

 Durham. Rev. J. Harriman, near Thirsk, Yorkshire. Mr. Baker, lopsham and 

 Haldon, Exeter. Mr. Pariitt. Pdvenhall; Kelvedon; Braxted, Essex. Mr. 

 Varenne. Epping Forest. Bev. J. M. Crombie. Haughmond Hill ! Shropshire. 



Wales :— Edderton Wood ! Montgomeryshire. 



Channel Islands :— Jersey and Guernsey. Mr. Larbalestier. 



" Spores .006 to .007 in. long, by .00075 in. broad." {Mudd.) " Spores .023 

 —31 mm. long, .003— .0045 mm. broad." (Nyl.) Spores .023— .025 mm. long, 

 .004— .0045 mm. broad. 



24. 0. Kthyrgodes, Nyl. reddish-brown, thin, continuous ; 

 lirellce black and shining, minute, scattered, sessile, oblong or 

 lineari-oblong, obtuse at the apices ; epithecium rimeeform, 

 margin thickish, round, inflexed ; spores 8, colourless, fusiform, 

 7-septate, 



