3 S ë o < K » e o 3 o s4 i
M i l l
in 1
ISOETES LACUSTRIS. QUILLWORT.
ISOETES lacustris ; frondibus subulatis obtuse tetragonis.
ISOETES lacustris. Linn. Sp. PI. p . 1563. Huds. Angl. p . 462. lig h t/. Scot. p. 683. With Bot
B — H o f fm .G c rm .e d is .U .s .p .* ? f e f f i —
/ m«A £ 191\ Schkuhr Crypt. p. 183. t. 1/3. Smith Fl. Brit. p . 1 144. E n il. Bot.
ft 1084. Decand. Fl. Fr. ed. 3. ml. S. p. 576. Fl. Gall. Sun. p. 1 1 7 . Alton Hort Kew
ed. 2. ml. 5. p . 530. Hook. Fl. Scot. P . 11. p . \6 0 . ‘
CALAMARIA folio breviore et crassiore. Dill. Musc. p. 320. t. 8 0 ./. 1.
SUBULARIA vulgaris erecta, folio rigidissimo. Raii Sun. p. 306.
Class a k d Oe d e e . CRYPTOGAMIA HYDROPTERIDES, m ild .
[Natural Ord e r . MARSILEACES, Brown. RHIZOSPERMrE, Decand. PILICES, f c - g P f f
GEN. Chae. Capsula membranaoea, non dehiscent, frondis basi immersa, unilocularis. Semina angulata, recen-
taculis pluribus filiformibus inserta.
GEE. Chae. Capsule membranaceous, not opening, immersed in the base o f the frond, one-celled. Seeds an-
gular, inserted upon many filiform receptacles.
Radix nucis Coryli Avellan* magnitudine, sublignosa,
intus albo-flavescens, extus fusca, valde fibrosa,
fibris majusculis, simplicibus, pallide fuscis, flex-
uosis, fistulosis.
l’ßONDES nümerosee, omnes radicales, quadri- nunc fere
sex-unciales et ultra, erecto-patentes, subulat®,
obtuse tetragon®, rigid®, fragiles, e tubulisquatuor
composite, isthmisque intercept®, basi insigniter
dilatat®, margine membranace®,dorso valde convex
®, intus convexiuscul®, squamis duabus fuscis.
Fructificatio duplex.
Invoiucra ovato-rotundata, membranacea, saccata,
fusca, undique clausa, in frondis basi immersa,
unilocularia, nunc foemina, nunc masculina.
IjivOLUCRUM MASC. (?) granulis ovato-oblongis, minu-
tissimis, obscure fuscis, disco hyalino, repletum. ;
InvoidCrum fcemin. (?) capsulis majusculis rotunda-
tis repletum. H® capsul® minutissime granulate
sunt ternatæ, vel e tribus cörporibus (semi-
na ?) triangularibus intus pulposis composite.
Root about the size of a hazel nut, somewhat woody, internally
of a whitish yellow colour, externally
brown, extremely fibrous, the fibres large, simple,
pale brown, fiexuose, hollow.
Fronds numerous, all springing from the root, from four
to six inches or more in height, between erect and
patent, subulate, bluntly four-sided, rigid, brittle,
composed of four tubes, divided by transverse
partitions, much swelled a t the base, membranous
at the margin; very convex on the back,
slightly convex on the inner side, bearing two
brown scales.
Fru ct ifica t io n two-fold.
I nvolucres ovato-rotundate, membranaceous, saccate,
brownj closed all round, immersed in the base
of the frond, one-celled, sometimes female, sometimes
male.
Ma l e (?) involucre filled with ovato-oblong very minute
dull brown granules, having their disk or
centre pellucid.
Female (?) involucre filled with large round capsules.
These minutely granulated capsules are three-
sided, or composed of three bodies (seeds?),
which are triangular and pulpy within. B SlZ6' 2 Poitionofthe frond to show its internal structure. Fig. 3 Base of
I tw,° scales- Ff V he 8ame Cat thr° “s'> a v e r s e l y to show the i^ofnereILcI
granules HI IB1 *nv?lucJe r®™°^ed- ^ 6- The same cut through to show the granules. Fig. 7. The
C H 1 Fe“ ale frond* FlS- 9- Base cut through to show the involucrum with its capsules F ir To
i ,Th,e Same CUt°Pen t0 sh™ M capsules, in which are seen t o S rm I g S
-aUmaJnS' ° P “ separate into three portions (Jigs. 13.), which are considered the seeds :
H H H f f l M B l a"d e!e™,ed lakes ia B H ports of Great Britain, especially in Scotland. The
Voirlich fri Tin i §atha!ed lri the shallow parts of Loch Sloy, a wild and unfrequented lake at the back of Ben
fmetification^n w “ * 1"'’ where 11P®*» aIonS "'‘th Sulmlaria aquatica and Lobelia Dortmanna, bearing its
h « v *m tec o S ntAindi-id!5alS of *hi? sp o^ sv a ty much in the structure of their fructification, or naturalists
tobc the case i ^ v ysnecime™ Wind capsule linmlucre) is two-celled, which I could never find
base, and extendi™ i? » » ? . "■ !lde"°", and SPr“ S!1 montion a number of filiform processes arising from the
the seeds or capsuL are a tachedS Tn" somont of tire involucre, and they call these the receptaclis to which
the capsules apneared hv d‘ ? , J f f ec’m.ens § c0Vld find “"'J 9 of filiform processes, and to these
no processes M i I— In Ilf f™ considered the male involucres, I could discover
immersed in n h o llow inV " P V f lnu“,e gmnoles without any apparent point of attachment. Both are
nor small brown scale bv th lh lw rT 1 M B f “ses I I leaves or fronds and fixed to the inside o f the supe-
The fronds I H W M H 01 ,valve’ Probably, the seeds are discharged when the involucre decays,
that these tubes H m I M f h y ? T A tl?nsverse section represents four tubes : a longitudinal one shows
e separated at regular distances by transverse bars or dissepiments, as in the tube of a Conferva.