8 BULLETIN DE L'HERBIER BOISSIER. 



18. Sagenidium, apothecia imniarginata; spora? transversim divi-ae, 



hyalinae. 



Tribus XI. — Thamnolie^e. 



Thallus podetiiformis, fistulosus; gonidia palmellacea; apothe- 

 cia lateralia in prominentiis stromatiformibus polycarpicis innata. 



19. Thamnolia, sporse siinplices. 



Tribus XII. — Siphule^e. 



Thallus podetiiformis aut compressus, solidus; gonidia pal- 

 mellacea (apothecia ignota). 



20. Siphula, (sporse ignotse). 



Tribus XIII. — Usnee^e. 



Thallus cylindricus (teres v. raro angulosus), solidus, centro 

 axi tractione sat elongabili percursus, phyllocladiigerus (fibriïlo- 

 sus); gonidia palmellacea; apothecia terminalia, lecanorina, ab 

 origine plano-peltiformia. 



21. Usnea, sporse simplices, hyalinae. 



Tribus XIV. — Alectorie^e. 



Thallus cylindricus et compressus, solidus, axis centralis non 

 tractibilis; phyllocladia deficientia; gonidia palmellacea; apothe- 

 cia juxta apicem defiexum ramorum spurie terminalia, ab ori- 

 gine plano-peltiformia, 



22. Bryopogon, sporse simplices, demum fuscae. 



Tribus XV. — Ramaline^e. 



Thallus cylindricus v. compressus v. auguste foliaceus, erectus 

 v. adscendens, undique corticatus, nunquam rhizinifer ; gonidia 

 palmellacea; apothecia lateralia aut sub apicc deflexo spurie 

 terminalia, primum concava, 



23. Theloschistes, sporse orculiformes, hyalinae. 



24. Ramalina, sporse 2-loculares. hyalinae. 



25. Anaptychia, sporae 2-locularcs, fuscee. 



