Tas. 4769. 
ALLOSORUS caALomELANos. 
Deltoid-leaved Allosorus. 
Nat. Ord. Fittcrs.—Cryprocamia Fruices. 
Gen. Char. (Vide supra, Tas. 4698.) 
ALLosorus calomelanos; frondibus czespitosis subcoriaceis (ramis simpliciter 
pinnatis) oblongo-triangularibus bipinnatis, pinnulis omnibus _petiolulatis 
cordato- (raro subhastato-) triangularibus obtusissimis integerrimis nunc 
subtrilobis sinuatisve, sinu angusto profundo, venis dichotome radiatis, 
soris marginalibus continuis, involucris membranaceis, stipitibus brevius- 
culis basi paleaceis rachibusque omnibus gracilibus atro-ebeneis nitidis. 
ALLosorus calomelanos. Presi, Tent. Pierid. p. 153. 
Preris calomelanos. Swartz, Syn. Fil. p.106. Willd. Sp. Plant. v. 5. p. 393. 
Schlecht. Adumbr. Fil. Cap. p. 43. t. 24. 
Prerts hastata. Thunb. Cap. ed. Schultes, p. 733. 
PLaTYLOMA calomelanos. J. Sm. in Comp. to Bot. Mag. 1846. p. 21. 
PELLza calomelanos. Link, Fil. Hort. Berol. p. 61. Fée, Gen. Fil. p. 129. 
Professor Kunze observes of this Fern, ‘“‘ Planta distinctissima, 
notissima, habitu quodammodo a genere (Péeride) discedit ; sed 
neque ad Allosorum, neque ad Cheilanthem pertinet, et veros 
Pteridis characteres offert.”” Whatever may be the views of 
botanists with regard to the separation of Ad/osorus from Pferis, 
there can be no question of this Fern belonging to the same 
group of Péeridee, with what Kunze himself has considered true 
Allosori ; A. cordatus (see our Tab. 4698) and A. fleawosus (our 
Tab. 4762) for example. Generically those plants never can be 
separated. Then again those who are most united in pro- 
- nouncing those two genera distinct, are quite at variance as to 
the name that should be given to the majority of the so-called 
Allosori of Presl. The group in question is named Platyloma of 
J. Smith, and he confines the name Al/osorus to Mr. Brown's 
genus Cryptogramma, which undoubtedly the author of “A//osorus 
(Bernhardi) included in it, but mixed with other Ferns so widely 
MARCH Ist, 1854. 
