228 BOTANY OF THE VOYAGE OE H.M.S. HEJIALD. 
lOiS. Gymnogramji-v calomdamSj Kaulf. 1. c. p. 76. — Acrostic/mm calomelanos, L., Willd. 1. c. 
p. 123. Common in the wliole province of Panama. 
Jamaica (Wilson), Pmia and Cocos Islands (Barclay), west coast of Tropical America generally, — 
V. V. Hort. Kew. 
1046. Leptogramma totta, J. Sm. 1. c. — Gymnogramma totta, Sclileclit. G. Loiveij Hook, et Grev. 
G.jyzlosa, Mart, et Gal. Syn. Fil. Mes. p. 27. t. 4. f. 1. Hacienda de Boquete, Veraguaa. 
Mexico (Galeotti), Brazil (Miers). 
1047. PiiEGOPTERis (Fee's Gen. Fil. p. 242*. —PoJi/pod'mm § Phegopteris, Presl, 1. c. J. Sm. 
I. e.) Seemannii, J. Sm. (Tab. XLIX.) ; irondibus pinnatis^ pinnis oppositis iato-lanceolatis attennato- 
caudatis laciniatis breve petiolatis, supcrioribus subsessilibus^ petiolis tubcrcnlato-stipulatis, laciniis 
cnrvatis obtusis intcgris facile disjuuctiSj vcnuHs 15-18^ inferioribus 4-5, ad angulum acutum conniven- 
tibus, inter lacinias connexas costam attingentibusj soris medio venularnm insidentibus^ inter venas 
biserialibus. — Frondes longe stipitatce, 2-8 pedes alt<e, pinnse 6-8 U7idas longce, 2 uncias lat<e, — 
Cape Corrientcs and Island of Cliirambiraj Dai'ien. 
In affinity this species comes nearest to Plumier's figure, tab. 21, which Swartz has (juoted with a 
marli of doubt for his ^ohjpodlum tetmgonum, and to which he also refers Schkuhr's tab. 18 b. ; hut the 
examination of specimens in Sir "W. J. Hooker's and my o^n herbarium, has satisfied me that the figures 
of Plumier and Schkuhr represent two distinct species ; Schkuhr's being the true Polypodium tetrago- 
mm of Swartz, which has the lower pair of venules anastomosing, and consequently is a Goniopteris, 
whereas the venules in Phegopteris, to which Plumier's and our present species belong, arc all free. But 
in regard to the technical distinction of free and anastomosing veins, these two species are peeidiar ; 
for although the veins are not truly anastomosing, yet their apices connive in a manner which in a 
measiu-e sets aside the character of free and anastomosing veins aa a generic distinction. "What tends 
to give the appearance of anastomosing veins to P. Seemannii and P. Plumierii is owing to the upper 
portion of the lower pair of venules converging towards the sinus between the laeinise, and iu the apparent 
margins of the lacinias heiug continued down to the rachis, but luiited like a seam (suture) below the 
sinus, which union ultimately gives way ; the lacinia; then appear as if they had been separated from each 
other by a sharp instrument. This peculiar structure is also found in a few other allied species. 
Plate XLIS. Pig. 1, portion of the leaves, magnified. 
1048. GoxioPTERis tetragona, Presl, Ptcrid. p. ISd. —Polypodium tetrayomm, Sw., Willd. 1. c. 
p. 203. 'W'^ood near Panama. 
St. Vincent (Caley), Cuba (Linden), Jamaica (Wilson).— v. v. Hort. Kew. 
1049. Mexiscium angustifolium, AYiUd. 1. c. p. 133. On rocks; on the banks of rivulets near 
Cmces and San Juan. 
1050. Mexiscium reticulatum, Sw., Willd. 1. c. p. 134. Island of Chh-ambira, Southern Darien. 
Brazil (Baddj), St. Vincent (Caley). 
1051. T.EXI0PSIS lineata, J. Sm. 1. c. p. er.— Vittaria lineata, Sw. Willd. 1. c. p. 404.— Presl, 
1. c. p. 145. Common in the woods of the Hacienda de Juan Lanas; growing on trees. 
St. Vincent (Caley), Jamaica (Wiles, Purdie). 
r- 
* After this paper was ready for the press, I received Pt5e's ' Genera PiUcum/ published in 1852, of 
which I have availed myself by making a few changes in nomenckture, iu order to avoid synonyms. 
