Fig. 3. 
Fig. 4. 
Fig. 6. 
EXPLANATION OF PLATES. 295 
Section of one of the same spermogones : a, ostiole ; 6, cavity; c, sterigmata; d, gonidia ; 
e, medullary tissue; f, cortical layer of thallus, the component cells full of beautiful 
yellow colouring matter. 
Sterigmata and spermatia of same lichen, 
. Physcia candelaria, Ach.; Scher. exs., 382. Portion of thallus, showing orange-coloured 
papilleform spermogones a. 
Sterigmata and spermatia of same plant. 
. P. flammea, Ach.; Cape of Good Hope. Portion of thallus, showing its orange-coloured 
papillzform spermogones a. 
. P, chrysophthalma, DC.; Long Island, North America. Portion of thallus, showing an 
apothecium a, and orange-coloured wart-like spermogones b. 
. Some of the same spermogones magnified: a, ostiole. 
. Sections of the same spermogones. 
. P. pulverulenta, Fr.; Scone, Perth. Portion of thallus, showing a, simple papilleform 
spermogones ; 8, largish, wart-like, frequently confluent ones ; c, apothecia. 
. Some of the same spermogones magnified: a, simple, papillaform; b, wart-like. 
. Apices of some of the wart-shaped spermogones, magnified to show the stellate-fissured 
ostioles a. 
. Sections of the same spermogones: a, simple, papilleform ; b, wart-shaped and confluent. 
. P. pulverulenta, Fr, Sterigmata and spermatia from different specimens. 
. P. aquila, Fr.; Cork. Portion of thallus, showing a, papilleform young spermogones ; 
6, the largish gaping ostioles of old spermogones ; c, apothecia, 
. Sterigmata and spermatia of different specimens of same plant. 
. P, stellaris, Fr., var. adglutinata mihi; Dumfries. Portion of thallus, showing a, apothecia ; 
b, papilleeform spermogones perched on thalline warts. 
. Sterigmata and spermatia of same plant. 
. P. flavicans, DC. (= Cornicularia erocea, Ach.) Sterigmata and spermatia. 
. Pywine cocées, Ach.; Demerara. Sterigmata and spermatia, 
. Coccocarpia plumbea, Lightf.; Tarbert, Loch Lomond. Portion of thallus, showing a, 
apothecia ; b, confluent spermogones ; c¢, isolated, papilleform spermogones. 
. Some of the same spermogones magnified: a, isolated; b, confluent, showing the irregular 
ostioles c. 
. Sections of the same spermogones: a, isolated ; 6, confluent. 
. Sterigmata and spermatia of same species. 
. Pannaria muscorum, Ach.; Scher. exs., 482, Thallus, bearing apothecia a, and papille- 
form spermogones 6. 
. Portion of a lacinia of same plant, magnified to show the reddish papilleform spermo- 
gones a. 
. Sections of the same spermogones. 
and 30, Sterigmata and spermatia of the same plant. 
P. rubiginosa, Del. ; Leighton exs,, 234, Thallus, bearing apothecia a, and papilleform 
spermogones b. 
P. triptophylla, Ach.; Scher. exs., 159. Two confluent thalli, bearing apothecia a, and 
black, roe-like spermogones b. 
Sections of the same spermogones. 
Spermatia of the same plant. 
Section of one of the spermogones of same plant: a, ostiole; 6, cavity; c, sterigmata 
d, gonidia ; e, medullary tissue of thallus ; f, cortical layer of thallus. 
