THE БЕУ. У. А. LEIGHTON ON NEW BRITISH LICHENS. 147 
internally brown; asci pyriform ; paraphyses none; spores 8, pale fuscescent, ob- 
longo-clavate, 1-septate, large. 
On holly, Trefriw, North Wales, 1874, very rare. 
broad. 
Fig. 1. 
Spores “029 mm. long, "0135 mm. 
DESCRIPTION OF PLATE XXII. 
Verrucaria myriospora, nat. size. 
. Same lichen, enlarged. 
. Section of perithecium, 
Asci. 
. Spores, magnified 1200 times. 
. Spermogonia. 
. Spermatia, magnified 330 times. 
. Verrucaria succina, its apothecium and 
perithecium, magnified. 
. Apothecium as seen from above, showing 
papilla and epithecium. 
. Structure of perithecium. 
. Spore, magnified 1200 times. 
. Paraphyses. 
. Lecidea subdiluta, nat. size. 
. Apothecium, magnified to show its pecu- 
liar elevato-sessile character. 
Fig. 15. 
16. 
17. 
18. 
19. 
. Spores, magnified 1200 times. 
. Melaspilea vermifera: apothecia, mag- 
Section of apothecium. 
Spores, magnified 1200 times. 
Lecidea advenula, nat. size. 
Enlarged representation of the same. 
Section of apothecium. 
nified, as seen from above in dry state. 
. Apothecia wetted, magnified. 
. Paraphyses. 
. Ascus. 
. Spores, magnified 1200 times. 
. Arthonia punctilliformis, nat. size. 
. Ascus. 
. Spore, magnified 1200 times. 
