n em u n ila te ra lia n u n c u p a t, q u o d a Harvey q u o q u e c o n firm a tu r. Hic
q u o q u e p in n a s ir r e g u l a r ite r d ic lio tom e Tissas ex p re ss is v e rb is d e s
crip sit. — F ragm e n ta qnæ vidi om n ium s p e c ie rum in e o co n v e n iu
n t , u t m a rg o v e sicu lifera e t m a rg o in s e gm e n ta su b d iv isa n um q
u am e a d em sit. Hinc ûnxi m a rg in em in f e r io r em e sse su b d iv is a in ,
p lu rim is c o n s e n tie n tib u s in e o u t m a rg o s u p e r io r v e sic u life ra sit.
Hoc q u o q u e ex a n alo g a Scytothalia c o n firm a ri v id e tu r , cu ju s p h y llo -
d ia e x te r io r i m a rg in e d e n ta ta e v a d u n t, in te r io r e s em p e r in te g e rrim a .
Si i t a q u e , bis p o s itis , S cytotha liam e t M arg in ariam c om p a r a -
m u s , c o n v e n iu n t in eo q u o d fro n s in u tra q u e a lte rn e p in n a ta sit.
P in næ Scytotlialiæ indivisæ m a n e n t, Marginariæ s u n t e x tro rs um s e -
m iflab e lla tim p in n u la tæ . Ju g am e n tum fro n d is (s em e l a lte rn e divisæ)
in M arginaria u lte riu s baud d e c om p o n itu r ; in S cy to th a lia , ram is n o vis
s o p ra axillas c o n tin u o em e rg e n tib u s , fro n s a lte rn e ra iiio s is siraa
evadit. Vesiculæ e t re c ep ta c u la ad s u p e r io r em m a rg in em p liy llo d i-
o rum in M a rg in a ria , ad ip sum ju g am e n tum in S c y to th a lia , ad
u tr am q u e axillæ m a rg in em in S e iro c o c co ta n tum o b v e n iu n t. Vesiculæ
e t r e c e p ta c u la e v o lu tio n e p e c u lia ri p ro c e s s u um m a rg in a lium in
M a rg in a ria fo rm a ri v id e n tu r ; in S e iro c o c c o e t Scytothalia u t p a rte s
om n in o novæ em e rg u n t.
Genus ab Adi. Rich ard in s titu tum , sed p o s te a ab ipso cum
Sargasso c o n ju n c tum , a M o n tag n eo ite rum re c e p tum a tq iie a H a rvey
a d o p ta tum , lic e t M arg in ariam d e n tib u s fo lio rum a Scytothalia
ta n tum d iv e rsam d e c la r a v e rit; m ih i ,, e v o lu tio n em in p ro x im is g e n
e rib u s a liam c o n s id e r a n ti, b e n e c irc um s c rip tum e t e x im ie n a tu ra le
a d p a r e t.
Sp e c ie s p au cæ h o d ie d um n o tæ , om n e s m a re a u s tra le in h a b i-
tan te s.
1. M. B o r y a n a (R ic h . A d d . N o v . Z e e l . H. p . 1 2 8 ), fronde pinnata,
pinnis longissimis linearibus uncinato-serratis, vesiculis elliptico
obovoideis subapiculatis, receptaculis cylindraeeis utrinque
acuminatis.
Sargassum Boryanum. Rich. l. c.
M. Boryana. Montagn. Prodr. Antarct. p. 101 et Yoy. au Pole Sud.
Tab. I I . et II I. fig 2. (ex cit. Mont.).
Hab, in m a ri a u s tra li ad o ra s Novæ Ze e landiæ (D ’Drville!)
Frons p in n a ta , inferne nu d a , superne pinnis pluripedalibus ornata.
Pinnæ omnino lin e a re s, 2—3 lineas la tæ , eoostatæ, spinulis uncinatis s e rr
a t e , simplices dichotomæ e t segmentis semper extrorsis semiilabellatæ,
interiore la te re vesiculas et receptacula gerentes. Vesiculæ magnitudine
iiucis Avellanæ angustioris, ex apiculo brevissimo ad basin petioli pollicem
ciroiter loiigæ., diametro transversali vix 4 lineas efficiente. Receptacula
p e r longam seriem marginalia, numerosissima, pollicaria, cylindracea utrinque
atten u ata , simplicia aut spinulis paucis in ramos aliquando e x c re s -
cenlibus ornata.
2. M. ÜRVitLiANA (R ic h . N. Z e e l. p. 10 ), frond e p in n a ta , p in n is
elon gat is c u n o a to - lin e a r ib u s u n c in a to ^ s i'r ra fis , ves icu lis sphæricis
m u t ic is receptaculis c y lin d ra c e o -c om p re s s is u t r in q u e acuminatis.
Forma latifolia: M. Urvilliana. Ach. Rich. t. c. tab. 3! Montagn. Prodr.
Antarct. p. 101 et Voy. au Pot. Sud. p . 60. tab. 3., f. 1; Rook, et
Harv. Fl. Antarct. p. 176! -
Sargassum Urvilleanum. Ach. Rich. Sert. Astr. p. 138.
Forma angustifolia: M. Gigas. Ach. Rich. l. c. tab. 41
Sarg. Lessonianum. Rich. Addit. Nov. Zeel. IL p. 137.
Hab. in m a ri a u s tra li ad o ra s Novæ Zelandiæ (D’ü rv ille ! ) e t
In su la s Auckland.
Frons pin n a ta , pinnis pedalibus et u ltr a , inferioribus b rev io rib u s.'
Pinnæ simplices, aut exteriore latere diohotomo-semiflabellatæ, introrsum
in c u rv a te e t interiore la te re vesiculas et receptacula g e ren te s, longissime
o u ne ato-line ares, enerves, acute s e rra tæ ; nuno angustiores, in fe rn e 2 fin e -
as superne semipollicem la tæ , nuno latiores, inferne 4 lineas superne pollioem
latæ. Vesiculæ. Piso majores, sphærioæ in petiolo bilineari. Recepta
cu la (in nostris) semipollicaria, compressa, utrinque acuminata.
Utramque speciem Richardianam eximiæ Auctoris liberalitati deb eo ,
sed nec ex speciminibus characteres quosdam novos utramque distin g u -
entes eruere valui, nec characteres ab ipso Auctori allatos sufficientes, ex
analogia aliarum specierum concludere audeo. Specimina latitudine segmentorum,
Icones ipsa forma generali frondis, aut latiori aut longiori, p ræ cipue
differunt. A M. Boryana sub stan tia magis m e m b r a n a c e a insuper distinguitur.
.
L X V I . S c y t o t h a l i a G re v . Aig . RrU . S y n . p. xxxiv. E n d l.
Gen. Pl. S u p p l. i t l . p . 3 3 . Scytothaliæ sp. Montagne^ P r o d r .
Cystoseiræ sp. Ag. e t A u c t.
F r o n s , e v o lu tio n e a lte rn e s u p r a - a x illa r i, d e c om p o s ito -p in n a ta su b e
c o s ta ta ; re c e p ta c u la ( e t vesiculas) e v o lu tio n e m a rg in a li a lte rn e
s e c u n d a u t o rg a n a d is c re ta g e r e n s , foliis cum cau le s u b c o n -
flu en tib u s . F o lia in d iv is a , lam in a v e rtic a li. V e s ic u læ (a x illa
re s sp hæricæ , a u t) n u ilæ . R e c e p ta c u la u t o rg a n a p ro p r ia a
m a rg in e ju g am e n ti s u p ra axillas em e rg e n tia , a lte rn e s e c u n d a
s im p lic ia p la n a , u tr in q u e fru c tig e ra . S c a p h id ia in fra u tr am -