forma et ramorura a caule proventu diverso, atque e forma vesicularum
et receptaculorum non admodum diflîcilis.
t S e c t io I. Fronde distiche pinnata.
* Caule compresso-piano, ramis a latere piano caulis egredientibus
relrofractis.
c . POLYCYSTIDEA. (A re sch . m sc r.J , caule p la n o d e c om p o s ito -p in -
n a t o , 'p in n i s a latere p ia n o caulis e g re d ie n tib u s ret ro fract is ,
p in n u lis d ic b o t om o -p in n a t is , ult imis in receptacula liliformia
to ru lo sa rostrata ab e u n t ib u s , ve s ic u lis n um e ro s is e lo n g a t o -e llip -
so id e is u t r in q u e acutis.
Hab. ad oras novæ Hollandiæ (Hb. Areschoug!)
Caulis in nostris tantum adest gracilior, pennam corvinam crassus
multipedalis, quadraugulus sed ita compressus u t fere planus appareat.
Pinnæ omnes ex hoc latere piano egrediuntur, 2—3-polIioares, inferne inte
r pinnulas supra basin abruptas flexuosp-angulatæ, superne pinnulatæ
fere fastigiatæ. Pinnulæ ultimæ filiformes, seta vi-x crassiores, pinnatim
dichotomæ. Vesiculæ in inferiore pinnarum p a rte numerosæ racemosæ,
singulæ aut sæpe binæ e rachi egredientes, elongato-ellipsoideæ, 2 lineas
c iroiter longæ, diametro lineam vix æ q u an tes , utrinque acutæ. Receptacula
a pinnulis ultimis o rta , filiformia, plerumque distanter et subunila-
te ra lite r torulosa, rostro .sterili te rm ina ta , pinnulis vix crassiora nisi locis,
quibus obveniunt scaphidia.
Species vesiculis distinctissima.
2. C. SÜBFARCINATA (M e r t. Mem. p. 13 !) caule plano decomposito
pinnato, pinnis a latere piano caulis egredientibus retrofractis,
pinnulis abbreviatis intricate pinnatis, ultimis in receptacula
pauci-toriilosa apiculo incurvo rostrata abeuntibus, vesiculis
obovoideis.
C. subfarcinata. Ag. sp. Alg. p. 83. et Syst. p. 289! Sonder Preiss.
p . 160!!
Hab. ad oras austro-occidentales Novæ Hollandiæ (Museum Paris.
I Preiss !)
Frons circumscriptione lanceolata. Caulis comp re sso -q u ad ran g u la ris,
alterne pinnatus, in nostris simpliciusculus. Pinnæ distantiis semipollfca-
ribus a latere piano alterne egredientes, basi retrofraotæ, dein horizontale
s, pinnulis inferioribus plerumque ab ru p tis, superioribus plus minus densis
e t intricatis. Pinnulæ ultimæ tuberculis fructigeris valde inflatis at
p a u c is ,(2—4) in s tru c tæ , torulosæ evadunt, apice sterili tuberoulum te r -
minale oblique rostrante. Vesiculæ in te r pinnulas ra ræ m in u tæ , linea vix
longiores, obovoideæ, juniores obtusissime apiculatæ. Species inter omnes
maxime coutraota et intrioato-densa.
3. C. Bro-wnii (T u rn . Hist. IV. p . 1 ), caule plano decompositopinnato,
pinnis a latere piano caulis egredientibus retrofractis,
pinnulis dicbotomo-pinnatis, ultimis in receptacula ovato-lan-
coidea verrucosa abeuntibus, vesiculis raris obovoideo-spbæricis.
F. Brownii. Turn. l. c. tab. 197!
Cystoseira Brownii. Ag. sp. Alg. p . 73. et Syst. p. 288! B o r y Voy.
Coqu, n. 33. Sonder Preiss. p . 139!
Hab. ad oras Novæ Hollandiæ (Menzies! Brown ! Preiss!); ad littus
Chilense (D’ürville, fide Bory).
Caulis usque quadripedalis, compresso-planus, 2-lineas la tu s , alterne
p in n a tu s ,e t in te r pinnas leviter flexuosus. Pinnæ basi explanata latitudinem
lateris caulis æ q u an tes, dein multo tenuiores, decomposite diohoto-
mo-pinnatæ, densissime p an ic u late . Vesiculæ (in nostris desunt, sec.
ïu rn e rum ) rarissimæ et præcipue in ramis inferioribus, obovato-sphærioæ,
magnitudine seminum Abri precatorii. Receptacula quam in cæteris omnibus
breviora, v ix -2 lineas longa,, tubercula 3—4 m o n stran tia , infra medium
crassiora et deinde ad apicem sensim a tten u ata , sed haud ro s tra ta ,
unde quoad formam quoque ab affinibus differunt.
4. C. DUMOSA (Grev. Synops. p. XX XIII) , caolo piano decompositopinnato,
pinnis a latere piano caulis -egredientibus retrofractis,
basi scalariformiter alterne obtuse aculeatis, pinnulis pinnulatis,
ultimis in receptacula. . . . , vesiculis numerosis sphæricis.
Hab. ad oras Novæ Hollandiæ (Hb. Greville!)
Caulis ultra p edalis, distantiis pollicaribus alterne pinnatus. Pinnæ
basi eximie retrofraotæ, p e r partem inferiorem minus compressæ et residuis
pinnularum vix semilineam distantibus et lineam lo n g is , trunoato-
obtusis, regulariter a lte rn is, (et ita quasi soalam formantibus) obsitæ; superne
pinnularum coma filiformi et vesiculis o n u s te . Pinnulæ potius pinnulatæ
quam dichotomæ, ultimis tantum semel furcatis. Vesiculæ, magnitudine
fere Pisi, ad apices ramulorum numerosæ.
Dum receptacula la te an t, incertum m an e t, utrum species s it diversa,
an tantum forma s terilis, sed habitu eximie diversa, C. BroWnii. C. Du-
mosam Sond. Preiss. p. 160 non vidi. Vesiculas pyriformes e t receptacula
oblonga moniliformiter tuberoulata nuncupat.
5. C. MONILIFERA (J. Ag. msc r.), caule plano decomposito-pinnato, pinnis
a latere piano caulis egredientibus retrofractis, basi aculéis obtusis
laxe munitis, pinnulis dicbotomo-pinnatis, ultimis in recepta-
16