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346 WHAT IS THE TIIAMES-SIDE BRASSICA ?
on the structure and morphology of Agaricus and Boletus ; and Plate
XCIX. was to have been one of ,a series in illustration of the subject,
but as the other subjects (some of them of a diagrammatic nature)
are not lithographed, I must content myself by merely explaining at
the end of this paper the first figures here published.
The following rare species of Ascomycetes Fungi have passed under
my observation during the present year :
Peziza (Discina) onotica, P.—Ringwood, Hants. The Eev. W. H.
Lucas.
P. (Saixoscypha) radiculata.—In great abundance on a hedgebank
near my own residence. The vivid yellow colour of this species gave
the bank the appearance of being covered with yellow crocuses.
P. (Sarcoscyplia) lanuginosa. Bull.—This recent addition to our
flora came up in several places under cedars in March and April last,
notably at Guy's Cliif, Warwick, and in the neighbourhood of Ware,
Herts. It was, however, totally absent from its original station at
Fetcham Park.
Morcliella crassipes, Pers.—I found several specimens of this gigan-
tic morel in the spring, in the woods about Little Munden, Herts.
Explanation of Plate XCVIII.— Figs. 1, 2, 3, Peziza (DiscinaJ macrocalyx,
Riess ; 4, section of ditto ; 5, asci and paraphyses, X 300 diam.
Explanation of Plate XCIX.—Fig. 1, Russula alutacea, Fr. ; 2, R. furcata,
Fr. ; 3, Agaricus fOmphaliaJ muralis, Sow. ; 4, Marasmius oreades, Fr.
; 6, Russula heterophylla, Fr. ; 7, Boletus edulis, Bull.
5, {Collybia ?)
WHAT IS THE THAMES-SIDE BRASSICA?
—
By Hewett C. Watson, Esq.
A species of Brassica occurs in many places along the Thames, on
both sides of the river, and on its intervening islets, where it separates
the counties of SuiTcy and Middlesex. The plant may be held tho-
roughly established there, if not an aboriginal native, extending its
occupancy from the immediate margins and osier-grounds of the river
to the ditch-sides and hedgebanks of the adjacent fields. Botanists
are not agreed on the specific name which this plant ought to bear,
sevei'al of them having entirely mistaken the species itself, and thus
having misapplied to the plant of the Tlianies side the name belonging
to a different species, to one wliich is most likely neither native nor well-
;