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Series III. lntricatæ.
Thallus fruliculosus vel filanientosus, ramosus, teres
vel compressus (absijue foliolis ullis vel erusta basali);
gonidia zonatim inter radices filamentorum medullarium
substrato corticali undique disposita. Apothecia
lecano-rina vel lecideina.
Trib. Yl. Roccellcæ.
Thallus cortice corneo tenui, medulla copiosa
fila-mentis implexis consistens jodo addilo cærulescentibus.
Apothecia normaliter lecideina.
Roccella DC.
Trib. VII. Usneece.
Thallus ramosissimus teres, medulla externe e
fila-menlis laxe implexa, interne e fasciculo centrali crasso
filamentorum longitudinalium adglutinatorum contexta.
Apothecia lecanorina, inargine plerumcjue ciliata, ciliis textura
thalli; sporæ parvæ simplices.
Usnea IIofFm. — (Adde n. g. Neuropogon N. & Fw.: N.
me-laxanlhus in rupibus Spitsbergensibus lectus est a Cel. Martins ex
herb. Delessert.) — Chlorea Nyl. (spec. C kl. vulpina [L.]).
Trib. VIII. Ixamalineæ.
Medulla ihalli teretis vel sæpius compressi laxa,
centro interdum cava. Apothecia lecanorina, niargine
thalliuo tenui integro.
AlecLoria Acli. pr. p. Exempla: A. jubata Fr., sarmenlosa
Acli., dipergens [Whlnbg], ochroleuca [Ach.], — Evernia Fr. pr.
p. (Spec. E. divaricala,prunaslri,]urjuracea.) — Ramalina Acli. —
Dujourea Ach.
Trib. IX. Cetrarieæ.
Thallus rigens plerumque compressus fruticulosus
vel fere foliaceus, intus filamentoso-stuppeus, superficie
(epilhallo) lævigatus. solilo spadiceo-coloratus. Spermatia
cylindrica.
Cetraria Ach. pr. p.1 (Spec. C. islandica, aculeata, odontella).
Series IV. Phylloideæ.
Thallus e fronde consistens dilatata, lobata aut
stel-lato-laciniata (rarissime fruticuloso-cæspitosa), medulla
media e filamentis laxe implexis formata, gonidia strato
peculiari versus superam ihalli paginam sub cortice
disposita. Apothecia peltiformia vel lecanorina vel lecideina
et gyrose conlorta.
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