TAB. CLIX. 
MARSILEA VESTITA. 
FILICES.—MansirgAcEx. Br. RuizosezmnwEx. Roth., DeCand., Spreng. 
HyvpnorrzrnripEs. W—illd. 
Gzw. Cmuan. | 7MLARSILEA, Schreb, Br. MARSILEZE Sp, Linn. LEMMA, Juss. 
Involucrum subovatum, clausum, multiloculare, loculis biseriatis, androgynis. —Z4nthere? 
numerosas, confertz, sessiles, uniloculares, evalves? polline globoso. Ovaria serie simplici 
antheris utrinque stipata, sessilia, ovalia, sub membrana duplici materia granulosa repleta. 
surculus repens. Folia quaternata, elongato-petiolata. — Involucra petiolo insidentia, v. a«illaria, 
sepius pedicellata. 
MansiLEa vestita; foliolis cuneatis subobliquis, petiolisque appressi-hirsutis, involucris ovalibus 
hirsutis axillaribus pedunculo subzque longis. 
Has. Ad flumen Columbiam, ora occidentali Americee Septentrionalis. Doupslas, Scouler. 
Surculus, vel Caudez, repens, filiformis, subhirsutus, basi precipue radicosus, radicibus fibrosis, ramosis, descen- 
— dentibus, nigris. : 
Frondes numerose, 3 vel 4 aggregate ex eodem puncto.  Petiolus (vel Stipes) subdigitalis, erectus, filiformis, 
appresse hirsutus, ad apicem gerens foliola 4, cuneata, adpressa et strigoso-hirsuta, integerrima, subobliqua, 
patentia. P articulati, superne attenuati. 
JInvolucra solitaria ad basin singuli petioli, axillaria, ovalia vel quandoque subquadrata, coriacea, hirsuta (demum 
glabriuscula) subcompressa, basi dorso unidentata, paulo infra apicem pedunculi insidentia, multilocularia, 
loculis in duas series dispositis, isthmis transversalibus, membranaceis, androgynis. JPedunculus hirsutus, 
involucri longitudine. | : 
Fructificationes biformes. — 4nthere? et Capsule ? plurimse in singulo loculo parietales et nervis vel receptaculis 
parietalibus, ut nobis videtur, ortum ducentes. 
Anthere ? parvee, obovatee, in stipitem brevem basi attenuatee, e membrana pellucida, albida, intus granulis parvis 
globosis flavescentibus replete. 
Capsule ? antheris majores, obovatz, breviter stipitate. Zntegumentum duplex. Exterius membranaceum, reticu- 
latum, hyalinum, reticulosum: zn£erius ovale, album, opacum, inferne tuberculo apiculato terminatum, inde- 
hiscens, intus massa gelatinosa atque granulis vel seminibus biformibus, aliis minutissimis angulatis, reliquis 
multo majoribus subrotundis farctee. 
Fig. 1. Foliolum. £f.2. Involucrum immaturum. . f. 8. Idem maturum. f. 4. Sectio verticali. f. 5. Sectio 
altera. f£ 6. Involucrum, hinc verticaliter sectum, vacuum, cum fasciculo vasorum. f. 7. Fasciculus 
vasorum. f.8. Capsula cum antheris quatuor. f. 9. Antherz portio, cum granulis seu polline. f. 10. Pollen. 
f 11. Capsula nuda. f. 12. Capsula rupta cum seminibus. f. 13. Pilus:—magn. auct. 
We are not aware that there have any where been published figures of the fructification of the 
genus Jarsilea which can give any idea of the curious structure of the involucrum and its contents. 
In this respect we trust that our representation will be found useful ; though, even here, we must 
observe that from the small number of 7?pe fruits we had to examine, and the great difficulty of 
distinguishing the situation of the parts after they had been dried, we do not pledge ourselves that 
the insertion of the supposed anthers and capsules is here represented with all the accuracy that 
could be wished. We would rather rely upon the figure of the next species, 77. polycarpa. "The 
immediate insertion of the fructifications within the involucre is unquestionably upon bundles of 
vessels, of which the principal one runs vertically along the centre of the back of the involucre, 
| and from each side there branch off several parallel forked bundles, to which the capsules and 
anthers are attached, and which correspond in number to the cells of the involucre. "These bundles 
of vessels we have been able to remove entire from within the involucre, as shown at figp.7. The 
genus Pilularia will probably be found to exhibit a somewhat similar structure, when its fructifica- 
tions shall be examined with the necessary minuteness. 
