DAB. COXXXIT. 
POLYPODIUM PARKERI. 
FILICES.—GvnaTzs. Br.  PorvsoprACER. Kaulf. | FirnrcEs verm. Br. 
Gzw. Cuag. POLYPODIUM, Linn. ori subrotundi (seriati, sparsi vel conferti). Zmvo- 
lucrum nullum. Zr. 
PorvPopniuM JParkeri; frondibus pinnatis pinnis lato-lineari-lanceolatis coriaceis nitidis glabris 
parallelo-venosis basi subinzquilaterali acutiusculo petiolatis brevi-acuminatis serratis versus 
apicem precipue soris pilis innumerosis mixtis costam approximatis, sub-biserialibus spar- 
sisque. 
Trichopteris n. sp. Parker, MSS. 
Has. Prope flumen Mazaronie in Guiana. Dom. Parker. 
Cuude» voveo 
Frons ampla, pinnata; pinnis subremotis, patentibus, spithamzeis ad pedalem lato-lineari-lanceolatis, rigidis, 
tenui-coriaceis, nitidis, costatis; costa subtus valde prominente ; pulcherrime horizontaliter parallelim venosis; 
venis approximatis simplicibus vel furcatis, ad marginem attingentibus; breviter subanguste attenuatis, ser- 
ratis versus apicem precipue; basi inszequilaterali; breviter petiolatis, glaberrimis. Hachis levis, glabra, 
dorso semiteres, facie superne plana, subcanaliculata. 
Sori lanosi, numerosi, semper coste approximati, sub-biseriales sparsique, serie unica coste contigua, altera 
magis interrupta, e costa remota. 
Capsule 15—920 in singulo soro, pilis innumerosis compressis subclavatis duplo longioribus immixtse, subrotundse, 
brevi-pedicellate, grosse reticulatze, annulo magno incompleto cinctze. 
Fig. 1. Portio frondis cum soris. f. 2. Sorus. f. 3. Capsulee:—magn. auct. 
Mr. Parker, to whom we are indebted for our knowledge of this splendid Fern, had rightly deter- 
mined it to belong to the genus Zvichopteris of Presl, and to be a new species. "That genus 
however, depending for its character solely upon the hairs which are mixed with the capsules of 
the sori, can hardly be considered as really distinct from Polypodium. | Since our figure of it was 
engraved, we have seen specimens which have the pinnz nearly twice as large as those we have 
represented. "The sori originate in two series near the lower part of the lateral veins; one series 
placed very near to the midrib, the other at some distance from it, and much more irregular in the 
disposition of its sor. Between these two series, and a little beyond the outer one, other sori are 
indiscriminately scattered. 
In the 7?ichopteris excelsa of Presl (the Polypodium Corcovadense of Raddi, and the P. 7tenitis 
of Roth), the sori are arranged in a single series, on each side, between the midrib and the 
margin. 
