940 THE REV. W. А. LEIGHTON ON NEW BRITISH LICHENS. 
perithecium dimidiate, black ; epithecium a minute роге; paraphyses distinct, long, 
thickish ; spores 8, colourless, elongato-acicular, slender, 3-septate. 
On slaty rocks, rare, 1876. 
Differing altogether from V. chlorotica (Ach.) in the attenuated acicular spores and 
other characters, as above. Gelatina hymenea I lutescent, especially asci and spores. 
Spores 034-035 mm. long, 004 mm. broad. Spermogonia numerous, minute, verru- 
carioid; spermatia excessively minute, oblong or lineari-oblong, straight. 
Goodwick Вау! Pembrokeshire (Sept. 1876). 
DESCRIPTION OF PLATE XXXII. 
Fig. 1. Lecidea impressula. Vertical section of an apothecium, enlarged. 
Fig. 2. Spores, magnified 1200 times. 
Fig. 3. Vertical section of the enlarged apothecium of Lecidea tephrizans. 
Fig. 4. Spores of L. tephrizans, magnified 1200 times. 
Fig. 5. Lecidea ryssolea, apothecium in vertical section, enlarged. 
Fig. 6. Spores of same, magnified 1200 times. 
Fig. 7. The enlarged apothecium of L. imponens, in vertical section. 
Fig. 8. Spores of L. imponens, magnified 1200 times. 
Fig. 9. Lecidea glaucomaria, vertical section of enlarged apothecium. 
Fig. 10. Spore of same lichen, magnified 1200 times. 
Fig. ll. L. parellaria, enlarged apothecium in vertical section. 
Fig. 12. Spores of L. parellaria, magnified 1200 times. 
Fig. 13. Lecidea endomelena. Ароһһесішп in vertical section, enlarged. 
Fig. 14. Its spores, magnified 1200 times. 
Fig. 15. Spores of Odontotrema minus, magnified 1200 times. 
Fig. 16. Spores of O. majus, magnified 1200 times. 
Fig. 17. Spores of O. longius, also magnified 1200 times. 
Fig. 18. Spores of Verrucaria neottizans, magnified 1200 times. 
Fig. 19. Spores of V. fumosaria, magnified 1200 times. 
Fig. 20. Spores of V. pertenuis, magnified 1200 times. 
