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10 MARINE ALG.E OF THE ARBROATH DISTRICT,
general habit was nearer roscum than either. At Prof. Haussknecbt's
suggestion, I will attempt to describe this form :—Plant
two feet high or more, branched from below the middle. Stem
terete, with two very faint pubescent lines, nearly glabrous. Leaves
all distinctly petioled, slightly but regularly sinuate-denticulate,
somewhat rounded at the base, lanceolate or oblong-lanceolate,
subacute, glabrous on both sides ; lower opposite, upper alternate.
Buds pubescent, erect, subapiculate. Petals ^ in. long, very pale
pink, becoming rosy. Stigmas clavate, but rudimentarily fjurlobed.
Capsules ex:remely slender, 1^-2 in. long. Seeds undeveloped
and shrivelled. [The form of /larrijloruw in this locality
is glabrescent, so that the same thing is natural in its offspring]
E. (oBscuRUM X PALUSTRE) X oBscuRUii. S:indy ride in a firplantation
near Tilford ; several plants (the same station where I
iound pal ustre x purnjjununin 1888). These I had thought might be
lAimyi X pahistre, but further study does not encourage that theory ;
nor do they quite match such specimens of simple ubscurwn x
jialustre as I have seen. On the other hand, there is no trace of any
different species, and the stigmas are clavate. They have deepgreen
leaves, bright rose-coloured flowers, expanding more than is
usual in ohscurwn ; and the young capsules are ashy-white with
appressed down. Eoughly speaking, they are much like what one
would expect to result from the suggested combination.
MARINE ALG^ OF THE ARBROATH DISTRICT.
By James Jack.
The district is bounded by Arbroath Bay (including it) on the
south, and extends to the crumbling rock beyond the sandstone and
conglomerate of the Red Head, The locality has been by no means
well examined, but the following plants collected are the result of a
paper contributed to the Arbroath Natural History Association, the
jiractical work being done during the past summer months. The
classificatiou and nomenclature adopted in the following list are
taken from Harvey's ' Phycologia Britannica,' as being the work
at the present time most generally referred to.
Htdidrijs siliqu(Ks/i Lyngb. Common in all pools about half- tide
level.
Fuciis vesiculosus L. Abundant on all low-lying rocks exposed
above low water.— F. serrntiis L. Common on rocks between tidemarks.
— F. iiodosus L. [AariijiliijUtim nudosiim Le Jolis). Common,
generally growing iu patches on boulders. — F. rrmnlinilntitf; L.
{ I'l'lrctid canalinilat'i Decne. & Thur. ). Common on rocks above
half-tide level, and exposed for several hours daily. N.B.—The
growth of Fuci is not so abundant on the old red sandstone as
among the boulders of the conglomerate.
lliiiuinthidia loira Lyngb. Common on all exposed rocks at low
water.