298 Linnean Society. 
Subfam. I. POLYPODIACEA, R. Br. 
Sporangia globose, or oval, transparent, unilocular, pedicellate, or rarely 
sessile, opening transversely by the elastic property of a vertical, rarely 
oblique, articulated ring. 
Tribe I. Potyropiex. Sori punctiform or elongated, destitute of a spe- 
cial indusium. 
Examples.—Polypodium, Sw. Grammitis, Sw. Hemionitis, Z. 
Tribe II. Acrosricuiz#. Sori amorphous, destitute of a special indusium. 
Example.—<Acrostichum, LZ. 
Tribe III. Preripem. Sori punctiform, or elongated transversely. In- 
dusium lateral, attached exteriorly. 
Examples.—Pteris, Z. Adiantum, L. 
Tribe IV. Aspienisa. Sori elongated, oblique. Indusium lateral, linear. 
Examples.—<Asplenium, Z. Diplazium, Sw. : 
Tribe V. Asprp1iex. Sori punctiform, intramarginal. Indusium orbicu- 
lar and central, or reniform and lateral, and attached interiorly. 
Examples.—Aspidium, Sw. Nephrodium, Mich. R. Br. 
Tribe VI. Dricksonizz. Sori marginal. Indusium lateral, attached in- 
teriorly, its free margin conniving with the indusiform margin of the 
frond, forming a calyciform bilabiate cyst. 
Examples.—Lindsza, Dry. Davallia, Sm. Dicksonia, L’Herit. Tricho- 
manes, L. Hymenophyllum, Sm. 
Tribe VII, Cyarnem. Sori punctiform, intramarginal. Indusium caly- 
ciform, or wanting. Receptacle elevated. 
Examples.—Cyathea, Sm. Hemitelia, R. Br. Alsophila, R. Br. 
These tribes are again subdivided into minor groups, founded upon cha- 
racters derived from the venation of the frond, the position of the sori, and 
the form of the indusium. Notholena and Ceratopteris are referred to 
the first, Ceterach to the fourth, and Onoclea to the fifth tribes, 
Nov. 3.—Mr. Forster, V.P., in the Chair. 
Mr. William Taylor, F.L.S., exhibited a sample of the oil obtained 
from the fruit of Madia sativa, grown at Aspall Stoneham, near 
Ipswich. 
Read, ‘‘ A Note on the Bokhara Clover.” By William Taylor, 
Esq., F.L.S. 
Mr. Taylor obtained from Mr. Loudon a small parcel of seeds of the 
Bokhara Clover (Melilotus arborea), which was sown early in April, 
1839. The plant proved to be biennial, and stood the winter well. 
On the 28th of April following, a part of the crop was cut down, the 
stems measuring 15 inches in height ; and on the 28th of May, from 
the same piece of ground, a second crop was obtained, which had 
reached the height of 16 inches; a third on the 28th of June, 17 
inches; a fourth in July, 16 inches; a fifth in August, 15 inches; 
and a sixth in September, measuring 14 inches. According to Mr. 
Taylor’s calculation, the Bokhara Clover would yield from 20 to 30 
tons of green herbage per acre, and from 2 to 3 tons of strong fibre, 
which appears capable of being manufactured into cordage. 
The flowers are white and very fragrant, and the plant does not 
appear to differ specifically from the Melilotus leucantha, although 
regarded by DeCandolle as a distinct species. 
