PLcbte. i.
P la t e I.
DICTYOTA ATOMARIA, Grev.
Gen. Char. Boot, a mass of woolly fibres. Frond flat, membranaceous,
ribless, reticulated, dichotomous or irregularly cleft. Fructification
consisting of scattered cr clustered somewhat prominent seeds on both
surfaces of tlie frond.
Diotyota atomaria ; fro n d broadly wmdge-shaped, or somewhat fan-shaped,
deeply and irregularly cleft longitudinally; seeds forming waved transverse
lines, with intermediate broken ones.
D io ty o ta a tom a ria , Grev. Alg. Brit. p . 5 8 . Hook. Br. I I . vol. ii. p . 2 8 0 .
Wyatt. Alg. I)anm. n o . 6 0 . In d i. 3rd Suppl. p . 2 4 . Harv. Manual, p . 3 3 .
J . Ag. Alg. Medit. p . 3 7 . Menegli. Alg. Ital. vol. i. p . 3 3 9 .
D iotyo ta zo n a ta , Lamour. I s . p . 57.
D ic ty o ta c ilia ta , Lamour. I s . p . 58.
ZoNAEiA a tom a ria , .Æ/. Y lÿ . vol. i. p . 1 3 8 . Ag. S y s t.-p. Grev. M.
Id in . p . 2 9 8 . Gray, B r. B l. vol. i. p . 3 4 1 .
P a d in a a tom a ria , Montag. I I . Canar. PI. Cell. p . 1 4 6 .
P a d in a p liasian a , Bory, M. Pelop. p . 75.
S t y po po d ium a tom a rim n , Kitlz. PJiyc. Gen. p . 3 4 1 .
U lva a tom a ria , Woodm. in Linn. Trans, vol. iü . p . 5 3 . In g . Bot. t. 4 1 9 .
U l v a serrata, BeCand. I I . Fran. vol. ii. p. 1 1 . Incycl. Bot. vol. vüi. p. 1 6 6 .
H ab. On marine rooks, rare. Annual. Summer. At Cromer, Mr. Wigg.
Gorton and Gnnton, Mrs. Fowler. Worm’s Head, Glamorganshire,
Mr. Bilhvyn. Coast of Devon, Mrs. Griffiths. Sussex, Mr. Borrer.
Frith of Forth, Br. Greville. Ballycotton, coast of Cork, Miss B all.
G e o g r . D i s t r . West Indies, Lamouroux. Canary Islands, rare, Bespréaux.
Mediterranean Sea, Agardh. German Ocean. Atlantic Coasts of France
and Spain.
D e s c . Boot, a b ro a d m a ss o f woolly, e n tan g led , b row n fibre s. Fronds c lu ste red ,
from 3 to 13 in ch es lo n g , a n d from h a lf a n in c h to 3 in ch es wide, d e lic a te ly
m em b ran a c eo u s, tra n s lu c e n t, p a le oHve-gi-een above, b e com in g d a rk e r to w
a rd s th e b ase, glossy, b ro a d ly w ed g e -sh ap ed , v a rio u sly cleft from th e apex
d ow nwa rd s, som etim e s v e ry m u c h ja g g e d , n ev e r q u ite enth-e ; th e la te ra l
m a rg in s e ith e r e n th e o r cL liato-dentate ; th e tip s o f th e la c in iæ tru n c a te .
Seeds d isp o s ed in d a rk b row n wavy tra n sv e rs e b a n d s , r u n n in g ac ro ss th e
w h o le fi-ond, a t in te rv a ls o f le ss th a n a n in ch , th e sp aces b e tw e en m o re o r
le ss d en se ly m o ttle d w ith b ro k e n lin e s o r uT e g u la r sp o ts o f seeds.
This beautiful plaut was discovered towards the eud of the
last century by Mr. Lilly Wigg, on the coast of Norfolk, and first
published in the third volume of the Linnsean Transactions by