c r a s s io r i b u s e t b r e v i o r i b u s , s o r is s p h æ r o s p o r a r um in p a r t e s u p
e r i o r e i n f r a - t e rm i n a l i s e gm e n t o r um e x p a n si s.
Rhodomenia Raerii Post, et Rupr. t. c,
Delesser ia Raerii Rupr. Alg. Ochot. p. 239!! (exol. syn.)
llab. in o c e a n o Glaciali ad o r a s L a p p o n iæ j n x t a p r om o n t o r . Kan
in ( I t u p r e c h t l ) ; in m a r l Ocho tz k (W o s n e s s e n s k y l ) .
Species a me ta n tum s ter i lis obs e rva ta e t n ondum sati s cogni ta, inter
D. ro s t r a tam e t D. co rymb o sam qu o d ammo d o intermedia, ab ut raque tamen
u t mihi vide tur dis tincta. Sect ione t ra sve rsal i p ar t is inferioris D. co rymbosa
fere omnino cyl indrace a a d p a re t ; D. Baerii vero c omp r e s so - an o e p s .
Ut raque inferne cras s i t iem p e n næ p a s s e r inæ tenuior is vix a t t ingi t ; rami
su p e r io re s fere setacei . D. ro s t r a ta e s t fere capillaris . Rami juniore s D.
ro s t r a tæ su n t magis p a ten te s quam iu reliquis . Sub microscopio obs e r v
a n tu r in D. ro s t r a ta quas i lineæ 3 c e l lularum elongatarum, q uæ ah apice
segme n to rum deor sum de c u r ru n t , cos tam quod ammo d o fo rmantes ; cellulæ
i s tæ su n t diamet ro duplo lo ngiores ; e x t r a has tr iplex se r ie s cellularum
a ngula ta rum in segment is penul t imis a d e s t et marginal is oous tat cellu lis
longi tudinal i ter elongatis et ser iatis . In D. Baerii eæd em cellulæ cos tales
a d s u n t a t breviores e t magis i r re gula re s ( in pianta Ochotens i ; I .apponica
mihi hoc re spe c tu diversa a d p a r e t ) ; cellularum ang u la ta rum p lure s ser ies
cos ta les cingunt , e t ma rginales fere ver t icales . In D. corymbosa cellulæ
cos tales cum cæte r i s conveniunt . Des cr ipl ionem fructus a Ruprecht io mu tu
a tu s sum. Hic S p orangia ma rginal ia longepedunoulata, apice d emum longe
subulatcf -candata, e t s p hæro sp o r a s in soros elongatos in fra ap ic em 2 - 3 -
fidum s egme n to rum col lectas descr ipsi t.
9. D. ANGUSTISSIMA (Griff, mscr.) f r o n d e l i n e a r i a n c ip i t e alis d e s t i tu
t a d i c l i o t o m o - p i n n a t a , s e gm e n t i s s u p e r i o r i b u s s u b c u n e a t o -
l i n e a r i b u s o b tu s iu s c u l i s m a r g i n e in t e g e r r im i s , c o c c id ii s in pliyllis
a x i lla r ib u s s e gm e n t i s q u e t e rm i n a l i b u s im m e r s i s , r o s t r o s u p e r em
i n e n t e d u p l o c r a s s io r i b u s l o n g i t u d i n e f e r e æ q u a l ib u s , s o r is
s p h æ r o s p o r a r um in p h y l l o r um a x i l l a r ium s e g m e n t o r u m q u e t e r -
m i n a l i um p a r t e s u p r em a im m e r s i s .
Deles ser ia angus t i s s ima Griff, mscr. in Harv. Phycol. Brit. tab. 83!
F ucus alatus y. angus t i s s imus Turn. Syn. Fuc. /. p. 14!i. Hist. tab.
ICO fig. k - l .
Dele s s er ia alata y. a ngus t i s s ima Ag. Sp. Alg. I. p. 179. Syst. p. 280.
Grev. Alg. Brit. p. 74.
Hypoglos sum angus t i s s imum Kütz. sp. p. 877.
Gelidium? ro s t r a tum Griff. in Harv. Man. p. 82.
Fu c u s alatus ju n io r Gm. Hist. tab. 25 fig. 2.
Hab. a d o r a s I n s u l a r um B r it a n n iæ (B r o d i e ! Dick ie!).
Cæspi tes in Lamina ria digita ta paras i tici , a callo radicali exeuntes
4 - 6 - p o l l i c a r e s . F rondes inferne ca ule s c ente s c r a s sæ e t fere te r e t iu scu læ’
diamet ro fere l ineæ dimidiæ, s u p e rn e s ens im tenuiores ancipites , ramo s
is s imæ. Ramif ic atio crebr i s dichotomi is orta , sed segment is in utroque
la te re rami pr incipal is brevior ibus , frons al terne pinna la evadit , pinnis
patent ibus , infer ior ibus longioribus. Segme nta su p e r io ra bas i levissime
angus ta ta, dein linearia, apice liifida aut subpinnata. Fru c tu s ut r iusque
gene ri s e t in segmenl is te rmina l ibus et in phyll is propr i i s axi llar ibus evolu
ti. Phylla coc cidiorum fere subulata, medio ob f ru c tum valde inorassata
et plus duplo cras s iora, lineam h aud longa ; pedicello coccidium longi tudine
fere æq uante, ros t ro s u p e r emin en te simpl ici a u t furcato ple rumque
breviora. Phylla s p hæro sp o r a rum l ineam longa e t longiora, s implic ia la n -
c eolato- l inear ia, aut sæp iu s div isa sub p a lma to -p in n a ta . Color co c cineo-
p u rp u r e u s . Su b s tan t ia membrana c eo-c a r t i la gine a .
Variæ, de hao pla n ta Auc torum opin iones. Veteres cum D. alata, varietat
is ad ins tar , conjunxerunt . D:na Griffiths p r ima , ni fallor, diversi tatem
indicavi t. Ipse affinitatem cum Gigart ina ros t ra ta Lyngbyei indicavi at
ut r amq u e ident ic am credidi, f ragment is ta n tum Scot ioæ speciei visis. Hodie
speciminibus complet is cognitis, aff initatem cum Delesser iis agnosoo
e t nomen a D:na Griffiths da tum conservo. Harvey in r ece nt is s imo quoque
oper is sui (Phycol. sub. lab. CCXLMl.) par to D. angus t i s s imam curn D.
alata conjungendam monet.
10. D. JUERGE.NSii (J. Ag. Sgmb. p. 1 4 ) fronde lineari ancipite-plana
alis destituta dichotonio-pinnata, segmentis superioribus pliyl-
lisque a margine prolificantilius snbcuneato-linearibiis obtusius-
ciilis margine serratis, fructibus phylla conformia marginalia
occupantibus.
Rhodomenia Juergens i i J. Ag. l. c.
S pæro co c c u s Juergens i i Külz. sp. p. 783.
Deles ser ia complanata Rvpr. Alg. Ochot. p. 245 !!
rial), in m a r i K amt sc h a li c o ( J i i r g e n s ! ) ad S:t P a u l (Mus . P e -
tr o p o l .! ) .
Fro n s p u rp u r e o - ro s e a , memb r a n a c e a , 3—6-poll icaris , l ineam vix lata,
in ferne subdichotoma, s u p e rn e pinni s ma jor ibus mino r ib u sq u e i r r egular i ter
inter sper s is decompos i te pinna ta. Pimiæ p in n u læq u e conformes, minores
b a s i eximio angus ta tæ, s e c u n d um æta tem a u t s e r r a tæ, aut incisæ, aut
pinnul is novi ordinis obs i tæ. Coccidia in pinnul is subdivi s i j sessilia ,
apice obtus iusculo s te rili p innulæ su p e ra ta . S p hæro sp o ræ in pinnul is
atque segment is te rmina l ibus , forma a s ter i l ibus vix diversis, imme r sæ,
apices p in n u læ co s ta tæ occupantes .
S t ru c tu r a De le s s e r iæ; cellulæ ma g næ minor ibus inte r spe r s i s cent rum
o c c u p a n t ; cellu lis pe r iphe r ic i s u n ic a serio dispos itis coloratis ro tu n d a to -
angulatis. Supertioies cellulas omne s æquales rotun d a to - an g u la ta s mons t rat ,
cos talibus cellulis ma rginal ibusque consimilibus. Costa i taque sub mic ro - I