110 DR LAUDER LINDSAY ON THE SPERMOGONES AND PYCNIDES 
Famity III. Lichenacei—continued. Genera. 
Tribe 8. Usneei, Neuropogon, N, and Flot. 
Usnea, Hoffm. 
Chlorea, Nyl. 
Alectoria, Ach. 
Series III. Ramalodei, . . Evernia, Ach. 
continued Tribe 9. Ramalinei, . . ‘\ Dufourea, Ach. 
Dactylina, Nyl. 
Ramalina, Ach. 
: oe Cetraria, Ach. 
Tribe 10. Cetrariet, { Plateaus, Hage. 
Nephroma, Ach. 
Nephromium, Nyl. 
Peltigera, Hoffm, 
Solorina, Ach, 
Tribe 11. Peltigerei, 
| Sticta, Ach, 
: : ‘ : As Ricasolia, DN. 
Series IV. Phyllodeil, . . ¢ Tribe 12. Parmelici, . . Pacmeha Anh, 
Physcia, Fr. 
Tribe 13. Gyrophorei, . Umbilicaria, Hoffin. 
/ 
Tribe 14. -Pyainet;).) 2 % Pyxine, Fr. 
Pannaria, Del. 
Coccocarpia, Pers. 
Amphiloma, Fr. 
| Squamaria, DC. 
| Placodium, DC., &c. 
( Psoroma, Fr. 
| 
| 
Series V. Placodei, Tribe 15. Lecanorei, pro parte, 
The part of NyLanpeEr’s table given above, refers to the filamentous, fruticu- 
lose, and foliaceous lichens,—those whose spermogones are described in this 
memoir. The other half relates to crustaceous lichens, which include the Leca- 
norei, Lecidinei, Graphidei, and Pyrenocarpet (or Verrucarie). 
In the researches on which the following memoir is based, I was in the 
habit of using the magnifying power 380 of a Nacuer’s microscope (“ petit 
modéle”), made in 1851, and a micrometer eye-piece made by James Bryson, 
Edinburgh. 
In giving measurements from the French, as I do in a few cases in describ- 
ing spermogones or their contents, which have been observed by NYLANDER or 
TULASNE, but not by myself, I have calculated the French millimetre as equal to 
ith of an English inch. The usual calculation hitherto has been yth; but I 
believe ;th to be more correct, and to be, therefore, gradually coming into more 
general use both in France and in this country. 
