Boutoniane. N. O. Filices. 
DCCCCXLIT. 
POLYPODIUM LEUCOSORUM, Boj. 
Th Al. q..1:.1 1 ere ° 
subintegro) profunde pinnatifidis glabris subtus flavo-fuscis 
opacis, lobis oblongis e lata basi sensim attenuatis obtusis 
integerrimis vel leviter sinnato-crenatis, soris biserialibus 
in singula lacinia inter costam et marginem junioribus pul- 
verulento-albis, venis internis, venulis primariis superioribus 
apice soriferis, stipite glaberrimo nudo gracili fronde mul- 
toties breviore, caudice crasso setaceo-paleaceo. 
Polypodium leucosorum, Bojer, Hort. Maurit. p. 417. (name 
only. ) 
Haz. Old mossy trees, forests of Nouvelle Decouverte and 
Grand Port, Mauritius, Bouton. Bourbon, Carmichael. 
T possess a specimen of this plant from Mauritius, sent by 
Mr. Bouton, with young fructification, exactly as he observes, 
“ couverte d'une poussiere blanche,” and another from Bour- 
bon, gathered by the late Capt. Carmichael. M. Bouton 
justly notices its affinity with Polypodium rigescens of Bory, 
figured at Tab. 216 of Hook and Greville’s Icones Filicum. 
Its very much larger size, different colour, differently shaped 
lobes, and segments, and, especially, the young white sori, are 
sufficiently characteristic of the present, as a species. A 
comparison of the figures of the respective species will satisfy 
any unprejudiced mind of the differences between the two. 
Fig. 1. Lobe of a fertile frond, seen from beneath :— 
magnified, 
