(«) Sori immersed in a short marginal cyst, the inchtsimn sub-coriaceoiis, continuovs with and scarcely different from the 
substance of the frond. 
2 PROSAPTIA, Presl. 183G. 
{(() Veins free. 
* Involucres stcdked. 
PERANEMA, Don. 1825. 
Sphaeropteris, Wall. MS. 1828. 
R. Br. 1830. 
Order POLYPODIACE^E. 
(«) Involucres cmiplete cup shaped. 
53 CYATHEA, Smith, 1793. 
Sphaeropteris, Bernh. 1800. 
Disphenia, Presl. 1836. 
(a) V^eins always luii-soriferous. 
54 ALSOPHILA, R. Br. 1810. 
Tricliopteris, Presl. 1822. 
Chnoophora, Klfs. 1824. 
Gymnosphaera, Bl. 1828. 
Dicranophlebia, Mart. 1828-34. 
Haplophlebia, Mart. 1828-34. 
Order POLYPODIACEiE. 
(«) Fronds dichotomously tyranched, 
55 GLEICHENIA, Smith, 1723. 
Mertensia, Willd. 1804. 
Decranopteris, Bernh. 1806. 
Calymella, Presl. 1836. 
19. PERANEMEiE. 
I Podielema, R. Br. MS. (1830.) 
I Nematopera, Kze. 1845. 
Trilje CYATHEINE^. 
§ 1. CYATHEA. 
I Notocarpia, Presl. 1836. 
I Schizocaena, J. Sm. 1838. 
2. ALSOPHILE^, 
Hymenostegia, J. Sm. pt. 1842, 
Trichostegia, J. Sm. 1842. 
Dichorexia, Presl. 1847. 
Lophosoria, Presl. 1847. 
Trichosorus, Liebm. 1848. 
Tritje GLEICHENINEiE. 
( rarehf nnhranched, ) the branches pinnatifid. 
Sticherus, Presl. 1836. 
Hicriopteris, Presl. 1849. 
Gleicheniasti-um, Presl. 1847. 
Order POLYPODIACEiE. Trihe TRICHOMANINE.^. 
(a) Involucres urn-Shcqyed or tubular. 
Veins free. 
t Beceptacles exerted, bearing Sessile leuticular Spore-cases at their base ; fronds pellucid . 
X Fronds monomorphous. 
56 TRICHOMANES, Lin. 1742. 
Achoraanes, Necker, 1790. 
Didymoglossum, Dev. 1827 
Lecanium, Presl. 1843. 
C'ardiomanes, Presl, 1843. 
Microgonium, Presl. 1843. 
Abiodictyum, Presl. 1843. 
Homceotes, Presl. 1847. 
Macroglena, Presl. 1847. 
