16. P. pulverulenta.
Ach. Syn. 214; Berwick Flora, ii. 81; Lichen pulverulentus, Eng. Bot. 2063.
On the bark of trees, not rare.
17. P. stellaris.
Ach. Syn. 216; Berwick Flora, ii. 81; Lichen stellaris, Eng. Bot. 1697.
On trees in Ravensworth and Cawsey Woods, D. At West Dipton near Hexham, and in Oak Wood near Wylam, N.
18. P. caesia.
Ach. Syn. 216; Lichen caesius, Eng. Bot. 1052; Dick. Crypt. Fasc. iii. 17.
On tiles upon the roofs of houses in and about Gainford, and upon rocks at Fawdon Slate, D. On the Crags at West Dipton near Hexham, N.
19. P. cycloselis.
Ach. Syn. 216; Lichen cycloselis, Eng. Bot. 1942.
Upon the branches of old Apple trees, N. and D.
20. P. physodes.
Ach. Syn. 218; Berwick Flora, ii. 82; Lichen physodes, Eng. Bot. 126.
γ platyphylla.
α. On trees and stones, common. In fructification on the stems of Heath upon Gateshead Fell, D.
γ On trees by Waskerley Bourn, and on the walls of Wolsingham Park, D.
68. BORRERA.
1. B. ciliaris.
Ach. Syn. 221; Berwick Flora, ii. 79; Lichen ciliaris, Eng. Bot. 1352.
On trees in woods, not rare.
2. B. tenella.
Ach. Syn. 221; Berwick Flora, ii. 79; Lichen tenellus, Eng. Bot. 1351; L. ciliaris ,β Hudson, 538.
β leptalea, Parmelia leptalea, Northumberland and
Durham Guide, ii. 55.
α. Upon trees, particularly the Black Thorn, and on Basaltic rocks at Holy Island, N. β on stones near Gainford, D. — Rev. J. Harriman.
3. B. furfuracea.
Ach. Syn. 222; Berwick Flora, ii. 79; Lichen furfuraceus, Eng. Bot. 984.
On the walls of Conset and Waskerley Park, and in the neighbourhood of Eglestone, also at Water Gate near Healy Field, D. Near Harbottle, and on Cheviot, Hedgehope, and Simonside, N. In Chillingham Park, and near Rawse Castle, N. —Dr. G. Johnston.
69. CETRARIA.
1. C. juniperina, β pinastri.
Ach. Syn. 226; Lichen pinastri, Eng. Bot. 2111;
L. juniperinus, Lightfoot, 836.
On the juniper near the High Force, on the south side of the Tees. — Rev. J. Harriman.
Never found in fructification.
2. C. glauca.
Ach. Syn. 227; Berwick Flora, ii. 77; Lichen glaucus, Eng. Bot. 1606; Lightfoot, 838.
On rocks and stones among moss in Sub-alpine situations, N. and D. Near Heddon-on-the-Wall, N.
3. C. islandica.
Ach. Syn. 229; Berwick Flora, ii. 76; Lichen islandicus, Eng. Bot. 1330.
On Gateshead, Whickham, and Muggleswick Fells, also on the moors in Teesdale and Weardale, D. On Cheviot, Hedgehope, Simonside, and the Wallington Moors, N. On Murton Crags, and the moors west of Belford, N.—Thompson's Berwick Plants.
70. STRICTA.
1. S. pulmonacea.
Ach. Syn. 233; Berwick Flora, 75; Lichen pulmonarius, Eng. Bot. 572; Lightfoot, 831.
On trees near Unthank and Rothbury, also at the foot of Cheviot above Langley Ford, N. On trees and rocks at Blackston Bank Wood near Wolsingham, also near Eglestone and Middleton-in-Teesdale, D. On trees between Healey Field and Allansford, D.— Mr. J. Thornhill.
2. S. scrobiculata.
Ach. Syn. 234; Berwick Flora, ii. 275; Lichen scrobiculatus, Eng. Bot. 497; Lightfoot, 850; L. verrucosus, Hudson, 545.
At the foot of Cheviot above Langley Ford, N. On rocks at Rawse Castle above Chillingham, and in woods above Renton Inn, N. — Dr. G. Johnston. On trees and stones in Shipley Wood near Eglestone, also near the High Force, Teesdale, and on the banks of Waskerley Bourn, near Wolsingham, D.
3. S. linibata.
Ach. Syn. 236; Lichen limbatus, Eng. Bot. 1104; Hook. Fl. Scot. ii. 59.
On rocks among moss near Eglestone, D. At the foot of Cheviot above Langley Ford, N.
4. S. sylvatica.
Ach. Syn. 236; Lichen sylvaticus, Eng. Bot. 2298; Lightfoot, 848.
On rocks among moss in Cawsey, Eglestone, and Blackstone Bank Woods, D. At the foot of Cheviot above Langley Ford, and in East Common Wood, N.
71. PELTIDEA.
1. P. horizontalis.
Ach. Syn. 238; Lichen horizontalis, Eng. Bot. 888; Lightfoot, 849.
On Gunnerton Crags, and at the foot of Cheviot above Langley Ford, N. On stones among moss in Hag-crag Wood in Teesdale Forest, and in the neighbourhood of Healy Field, D.
2. P. apthosa.
Ach. Syn. 238; Lichen apthosus, Eng. Bot. 1119; Lightfoot, 847.
At the foot of Cheviot above Langley Ford, and on Gunnerton Crags, also on rocks at Shewing Shields, where it was noticed by Wallis, N. On stones among moss in Hag-crag Wood in Teesdale Forest, D. In Holwick. — Rev. J. Harriman.
3. P. canina.
Ach. Svn. 239; Berwick Flora, ii. 73; Lichen caninus, Eng. Bot. 2299.
On earth and stones, common.
4. P. rufescens.
Northumberland and Durham Guide, ii. 61; Berwick Flora, ii. 74; Lichen rufescens, Eng. Bot. 2300; Peltidea canina γ crispa, Ach. Syn. 329.
On Gunnerton Crags near Barwesford, and at Shewing-shields, N. In Teesdale, and the neighbourhood of Healey Field, D.
