364 DR. LINDSAY ON WEST-GREENLAND LICHENS, 
DESCRIPTION OF THE PLATES. 
Prate XLVIII. 
Figs. 1-5. Calicium furfuraceum, L. 
1. Scherer’s Exs. 14: a, sporidia; 5, ste- 
rigmata and spermatia. 
.2 Var. fulva, L. Scher. Exs. 296: spo- 
ridia. 
3-5. Var. sulphurella, Fr. 
3. Schær. Exs. 639: sporidia. 
4. Nylander, Exs. : sporidia. 
5. Hepp, Exs. 154: sections of spermo- 
gone, showing sterigmata and sper- 
matia. : 
Fig. 6. Cladonia alcicornis, Flk., Leighton, Exs. 15: 
stylospores of parasitic pycnidia. 
Fig. 7. C. cervicornis, Ach., Jakobshavn : a, por- 
tion of thallus, showing the pseudo- 
spermogonia; 5, cellular tissue of one 
of their perithecia; c, spores. 
Fig. 8. C. gracilis, L., Jakobshavn: a, spore- 
chains of parasite; b, alien sporidium 
(Buellioid). 
Fig. 9. C. bellidiflora, Ach., Ireland : a, portion 
of thallus, showing the parasitic Leci- 
dea Cladoniaria, Nyl.; b, section, show- 
ing its apothecia and pycnidia. 
Fig. 10. C. deformis, L., Jakobshavn : a, portion 
of thallus, showing the pseudo-apo- 
thecia; 5, one of these stipitate pseudo- 
apothecia isolated ; c, spore-chains. 
Fig. 11. C. degenerans, Flk., Godhavn : a, b, por- 
tions of thallus, showing. the mar- 
ginal spermogonia; 
isolated. 
Fig. 12. C. fimbriata, Hffm., Jakobshavn : a, por- 
tion of a podetium covered with the pa- 
rasitic pycnidia; 5, c, sections of one 
ofthe latter; d, isolated stylospores ; 
e, isolated stylospores with basidia 
still attached. 
C, spermogonia 
e: 13. C. deformis, L., Schær. Exs. 49: stylo- 
spores of parasitic pycnidia 
Fig- 14. Lecidea cladoniaria, Nyl., on Cladonia 
uncialis, L., Birnam Hill: stylospores 
and basidia of pycnidia. 
Fig. 15. Thamnolia vermicularis, Sw., Jakobshavn: 
a, cornute condition ; b-g, Microthelia 
vermicularia, Linds.: 6, perithecia; 
c, spermogonia; d, asci; e, sporidia ; 
f, spermatia; g, oil-globules. 
Fig. 16. Cetraria islandica, Ach., Norway, bear- 
ing the parasitic Lecidea cetraricola, 
Linds.: a, portion of thallus, showing 
the deformed apothecia of the Lecidea, 
and the cyphelle of the Cetraria; 
b, sections of the said apothecia; 
c, section of hymenium in Braemar 
forms, showing an ascus (under iodine), 
and sporidia. 
Fig. 17. C. nivalis, L., Jakobshavn: portions of 
thallus showing the marginal spermo- 
gonia. 
Fig. 18. Dactylina arctica, Br., Kikerton Islands : 
a, portion of thallus, showing spermo- 
gonia; 6, section of a spermogone, 
showing sterigmata and spermatia; 
€, Sporidia.. 
Fig. 19. Nephroma arcticum, L., Godhavn : a, por- 
tion of thallus, showing marginal sper- 
mogonia; 5, free spermatia. 
Fig. 20. Peltigera canina, Hfim., Lyngemarken : 
a, portion of thallus showing an apo- 
thecium and marginal pycnidia; 5, sty- 
lospores and basidia of pycnidia; 
c, sporidia; d, oil-globules. 
Fig. 21. P. canina, on tufts of Bolax, Falkland 
Islands, Dr. Hooker, in Herb. — 
sporidium. 
Fig. 22. P. canina, Schær. Exs.: a, ascus and its 
protoplasm under the action of iodine ; 
6, sporidia. 
Fig. 23. P. canina, Scotland : a, section of hy- 
