Plate 56. 
ISOETES Dublei, Bury. 
Durieu s Quittwort. 
Isoetes Buried; leaves slender, filiform, subcompactly cellular, the tuft con¬ 
tracted above the bulbiform base, then spreading and recurved; rhizome 
below the leaves clothed with dark-brown, rigid, pungent, trifid scales; 
oophoridia strongly granulated. 
Isoetes Durimi. “ Bory, Compt. rendu Acad. Sc. vol. 18, June , 1844.” A. 
Braun in Bory , Explor. Scientif. de (Algerie, partie Bot. pi. 36. /. 2 
(no description). Grenier et Godron, FI. de France , v. 3. p. 652. 
Isoetes Hystrix. Wolsey in Fliytol. new ser. v. 5. p. 45 (not of Durieu in Bory, 
Fxplor. Scientif. de VAlgerie, pi. 36./. 1 (no description ), and of Grenier 
and Godron, l. c.p. 652). Cosson in Bourgeau, PI. d’Espagne et de Portugal, 
1853, n. 2049. 
Isoetes Hystrix var. subinermis. Balansa, PI. d'Algerie, 1851, n. 27, and 1852, 
n. 694; ejusd. PI. d’Orient, 1857, n. 1327. 
Hah. Damp spots on L’Ancresse common, Guernsey, Mr. G. Wolsey , 
This first discovery of this species of Isoetes, in “ lieux incultes 
et steriles ” in the south of France, in Corsica, at Ajaccio {Be- 
quien ), and at Cannes (_ Dunal ), could not fail to attract the atten¬ 
tion of botanists; and it became still more interesting to British 
botanists on its discovery in British territory, Guernsey, in June, 
1860, by Mr. George Wolsey. The species is only described in 
one or two works, not easily accessible to a student of British 
botany, and figured (without description) only in one rare and 
costly work, on the plants of Algeria; and it is not surprising 
that it was mistaken for the I. Hystrix of Durieu, also an inha¬ 
bitant of Corsica and Cannes in “ paturages secs, montueux et 
decouverts, jamais dans les terrains inondes.” Both are remark¬ 
able for blackish-brown, shortly three-spined, imbricating scales on 
the rhizome, below the leaves, of which there is no trace in Isoetes 
lacustris, nor, as far as I am aware, in any other known species 
of the genus, save in I Hystrix where these scales are so abun¬ 
dant and so long, that in the figure given in the Algerian Flora, 
the base of the plant forms a nearly globose ball, an inch and a 
half in diameter, clothed with long, black, incurved spines, a 
quarter of an inch long, naturally suggesting the specific name 
of Hystrix. In other respects the two plants have certainly the 
