Mr. Brown on Woodsia, a new Genus of Ferns. 173 
WOODSIA. 
Sori dorsales, subrotundi. 
Involucrum calyciforme apertum margine crini- 
tum : includens Capsulas pedicellatas : recep- 
taculo communi elevato. nullo. 
Filicule, frondibus cespitosis, pinnatim divisis ; pilis 
simplicibus squamulisque angustis instructa. 
ilvensis. 1. W. frondibus bipinnatifidis, pinnis oblongis, pin- 
nulis: confluentibus multifloris : inferioribus. 
subrepandis:: infimis subaqualibus.. 
Polypodium ilvense. Swartz. Synop.. Fil. 39. Will- 
den. Sp. Pl. 5. p.198. Schkuhr Crypt. 16..t. 19. 
Acrostichum ilvense. Linn. Sp. Pl. ed. 2. p. 1598. 
Nephrodium lanosum. Michauz Amer. 2. p. 198. 
Habitat, in spi bonia eet Aperi. pealis 
TNT (ut: Dak du emn 
FE 2. v. frondibus pinnatis, pinnis g raas in ab 
longisve inciso-pinnatifidis: lobis integerri- 
ER paucifloris : antico baseos productiore.. 
Tab. XI. 
Polypodium hyperboreum. Swartz. Synop. Fil. 39. 
Willden. Sp. Pl. 5. p. 197. Engl. Bot. 2023. 
Polypodium arvonicum. Smith Ff. Brit. 3. p. 1115.* 
Polypodium ilvense. Withering Arrang. ed. 3. t.3. 
P- 114. 
Acrostichum hyperboreum. Liljeblad in Act. 
Stockholm. 1793. p..201.. 1. 8.* | 
Acrostichum alpinum. Bolton Fil. Brit. 76. t. 49. 
Ceterach alpinum. Lamarck et Decandolle Fl.. 
Fran. 2.. p. 567. 
Habitat in Europe alpibus. (v. v.) X. 
EX- 
