346 WHAT IS THE THAMES-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 Rev. W. H. 
Lucas. 
P. (Sarcoscypha) 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. (Sarcoscypha) lanuginosa, Bull.—This recent addition to our 
flora came up in several places under cedars in March and April last; 
notably at Guy's Cliff, Warwick, and in the neighbourhood of Ware, 
Herts. It was, however, totally absent from its original station at 
Fetcham Park. 
Morchella crassipes, Pers.—I found several specimens of this gigau- 
tic morel in the spring, in the woods about Little Munden, Herts. 
EXPLANATION OF PLATE XOCVIII.— Figs. 1, 2, 3, Peziza ( Discina) macro- 
calyx, Riess ; 4, section of ditto; 5, asci and para physes, x 300 diam. 
Peor aperi OF PLATE —Fig. 1, Ru — alutacea Fr.; 2, R. fur- 
aricus (Omphalia) muralis, 'Sow mius oreades, Fr. ; 
5, (Cota ?); Te, Russula heterophylla, Fr.; ; 7 RAM: sio Bull. 
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 Surrey 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, 
several of them having entirely mistaken the species itself, and thus 
having misapplied to the plant of the Thames side the name belonging 
to a different species, to one which is most likely neither native nor well- 
