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1. Genus Nitella Agi).
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Simpliciler tubulosæ, læves, inermes, diaphanæ,
fle-xiles. Exinvolucratæ. Radii ebracteati: friactiferi ilivisi,
fructificatione in angulo divisuræ. Globuli epigyni.
Sect. 1. Ebracteatæ.
Radiorum axis divisus.
A. Radiis repetito-divisis.
† Radiolæ. Radii frucliferi passim Iriplicalo-divisi,
apice arliculatim mucronati, vel breviler corniculati.
(Exoticæ.)
†† Dichotomæ. Radii fructiferi passim duplicato—
divisi, apice (plerumrjue) articulatim mucronali, vel
brevi-ter corniculati.
(I. cruribus terminalibus mucrone articulatim inserto,
vel corniculis instructis. a. cruribus infra arliculum
api-calem continuis.)
1. N. norvegica Wallin.
lä. — mucronata, Al. Br.
heteromorpha Al. Br.
3. — capi/laris Wallm.
B. Furcatæ. Radii simpliciter (semel) divisi.
1. cruribus terminalibus mucrone articulatim
inserto armatis.
4. 2V. Wahlbergiana, Wallm.
2. cruribus terminalibus apice contiuuis. exarti
culatis.
(a. radiis cylindricis.)
† Monoicæ.
5. N. flexilis Al. Br.
†† Dioicæ.
6. N. syncarpa Tbuill.
— opaca Ag.
— alrovirens Wallm.
— lejopyrenct Al. Br.
Sect. 2. Pseudobracteatæ.
Axis radii primarii usque ad apicem verticilli
pro-lensus, ad genicula radiis minoribus, in modum bractearum,
stipatus.
(B. Proliferæ. Radii articulo terminali instructi;
steriles plerumrpie simplicissimi.)
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