greatest resemblance to each other, so that Mr.Wolsey is not far 
wrong in calling the present plant 1. Hystrix, though Mr. ] Al¬ 
lans a has probably pursued a better course, in naming our plant 
/. Hystrix, var. subinermis; and it is not a little remarkable that 
the two are found in nearly the same localities both in the south 
of France and in Algeria. The exotic specimens of I. Huricei in 
my herbarium are from Limoges, France (M. de Notaris), in “ pe- 
louses humides,” near the summit of the Sierra de Ficota, near 
Monchique, Algarve, Spain ( Bouryeau); rocky hills above the 
village of Kaiageul, near Ouchak in Phrygia ( Balansa ); Algeria, 
Coteau de Homma (Mr. Thos. Birch), Oran, “ dans les flaques 
d’eau,” and between Oran and La Senia, “bords des mares” (Ba- 
lansa). True I. Hystrix I possess from Algeria, Mostaganem, 
“clairieres des broussailles” (Balanso), and from “ Straoucli,” col¬ 
lected by Mr. Birch. 
Plate 50. Pig. 1, 2. Fertile plants of Isoetes Duriaei, Bory, with a circle of 
mature fruits:— natural size. 3. Lower portion of the plant, with its rhizome 
cut through vertically,— slightly magnified. 4. An inner leaf, with its fructifica¬ 
tion in the base. 5. Transverse section of the same above the base. 6. Base: 
—more magnified. 7. Transverse section of the same. 8. Capsules. 9. Sec¬ 
tion of do. 10. Minute granules, or antheridia. 11. Inner leaf, with its fruc¬ 
tification in the base. 12. The base, cut through transversely. 13. Young 
subtetrahedral grains ( oophoridia ). 14. Mature do. 15. Scales from the base 
of the rhizome; middle one seen from behind, the lateral ones in front:— more 
or less magnified. All the figures are made from specimens kindly sent by Mr. 
Wolsey. 
