294 
Fig. 
Fig. 
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iL, 
12. 
13. 
14. 
15. 
16. 
ate 
18. 
19. 
20. 
21. 
22. 
23. 
24. 
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26. 
27. 
28. 
29, 
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31. 
32. 
33. 
34, 
305. 
36. 
37. 
38. 
EXPLANATION OF PLATES. 
Section of the same spermogones, showing the depressed form of ostiole a. 
Sterigmata and spermatia of same plant, 
Physcia villosa, Dub., var. Dickiana mihi, Belfast. Portion of thallus, showing apothecia a, 
and beautiful large orange-coloured spermogones b. 
Section of same plant, showing the relation of the apothecium a to the spermogones 8, 
The apothecium is dotted over with the small black perithecia of a parasitic fungus. 
Section of one of the same spermogones: a, ostiole; b, cavity; c, sterigmata; d, gonidia ; 
e, medullary tissue of thallus ; /, cortical layer of thallus. 
Sterigmata and spermatia of same plant. 
P. leucomela, Mich.; Cork. Portion of thallus, bearing black papilleform spermogones a. 
Sterigmata and spermatia of same plant. 
P. ciliaris, DC.; Baithayock, by Perth. Portion of thallus, showing a, large, irregular, 
wart-like spermogones, frequently confluent, and with stellate-fissured ostioles; 6, brown 
papilleform spermogones ; and c, punctiform spermogones, as in Scher. exs., 388. 
One of the large papilleform spermogones magnified : a, ostiole. 
Sections of the same spermogones, 
P., stellaris, Fr., var. tenella, Scher.; Penmanshiel, Berwickshire. Portion of thallus, 
bearing a, apothecia; and 6, papilleeform spermogones. 
P, stellaris, Fr., var. tenella, Sch. Sterigmata and spermatia from different specimens— 
Scher. exs., 348 ; exs., 349; and exs., 352. 
P. stellaris, Fr. (= Parmelia aipolia, Auctt.) Portion of thallus, showing numerous 
papillzform spermogones a. 
Another specimen of the same plant, having brown, instead of black, papilleform spermo- 
gones a, 
Some of the same spermogones magnified: a, ostiole. 
P. stellaris, Fr. ; Scher. exs., 350. Portion of thallus, showing spermogones grouped on 
wart-like prominences of thallus a, 
Parmelia stellaris, Fr. (= Parmelia aipolia, Auctt.) Sterigmata and spermatia. 
P. stellaris, Fr., var. albinea, Ach. (= Parmelia erosa, Borr.); Falmouth. Sterigmata and 
spermatia. 
P. cesia, Fr.; Skye. Portion of thallus, showing papilleform spermogones a, and terminal 
soredia 6. 
Sterigmata and spermatia of same plant. 
P. obscura, Fr.; Rescobie, Forfarshire. Portion of thallus, showing the minute, brown, 
papilleform spermogones a. : 
Some of the same spermogones magnified : a, ostiole. 
Sections of the same spermogones. 
P. obscura, Fr. Sterigmata and spermatia. 
P. obscura, Fr.; Cork; bearing on its thallus the parasitic Lecidea obscuroides mihi a. 
Sections of the apothecia of L. obscwroides, showing them in different stages of development: 
a, mature; b, c, young, 
Theca and spores of the same Lecidea. 
Pruate XIV. 
Illustrative of the genera Puyscta, Fr., Nyl.; Pannarta, Del., Nyl.; and Coccocarpia, Pers., Nyl. 
Fig. 1, Physcia parietina, L., var. polycarpa, Ehrh. ; Hepp. exs., 54. Portion of thallus, showing 
the numerous crowded apothecia a, and the papilleform spermogones b. 
Fig. 2. P. parietina, L., var. laciniosa, Scher. ; Scher. exs., 383: a, orange-coloured papilleform — 
spermogones. 

