TAD. CCV. 
ACROSTICHUM SUBDIAPHANUM. 
Li 
FILICES.—GvmnATXxX. Br.  PorvPoDIACEX. Kaulf. | Frxicrs verz. Willd. 
GEN. Cuag.. J4CROSTICHUAM, Linn. Sori amorphi, seu Capsule per totam paginam infe- 
riorem frondis (interdum diversa) vel ad ejus partem sparse.  Zndusium nullum (nisi squa- 
mule vel sete in quibusdam capsulis interstinctze). Br. 
AcnosriCHUM subdiaphanum ; frondibus oblongis subsucculentis acutis marginatis arcte parallelim 
venosis supra squamosis subtus ferrugineo-punctatis, fertilibus linearibus, stipite costaque 
subtus paleaceo-squamosis. 
Has. Insula Sancte Helenz. 24/ex. JF/alker, olim Insulae Praefectus; ID. Dallas. Prope 
Madras. G. IZ;2Àt, M.D. 
Caudex repens, crassus, densissime paleaceo-squamosus; paleis laxis, lanceolatis, membranaceis, nitidis, fuscis, 
pulcherrime et tortuosim reticulatis basi cordatis, subtus radices filiformes emittens. 
Stzpites digitales et ultra, erecti, hinc sulcati, squamis numerosis magnis laxis fuscis obsiti. 
Frondes 5—8 uncias longs, coriaceo-succulente, subdiaphans, siccitate undulatze, oblongae, acuts, marginatze, 
costatze, oblique et arcte dichotome parallelim venosz, supra squamis subcordato-rotundatis, laceratis saepis- 
sime peltatis sparsim obsitze, subtus minute ferrugineo-punctatz. ^ Cosa supra plana, nudiuscula, subtus laxe | 
paleaceo-squamosa, squamis ut in caudice et stipite. — Frondes fertiles longius stipitatee lineares. 
Capsule totum dorsum frondis tegentes, fusce, globosce, lato-annulatze, longiuscule stipitatze. 
Semina. subreniformia. 
Fig. 1. Portio frondis sterilis cum squamis. f. 2. Portio frondis subtus visa. f. 3. Capsule. f. 4. Semina. 
f. 5. Squama e stipite :—magn. auct. 
This is the second new species of z4erostichum which we have figured from the island of 
.St. Helena; and it is not a little remarkable, that in both instances we have received the same 
species also from Madras, through Dr. Wight. "That now given is no less distinct than the former 
one (74. dimorphum) from all others which are known to us, and is remarkable for its thick and 
somewhat fleshy texture, causing it to shrivel to a certain extent in drying, and for its subpellucid 
frond. "The nerves are closely placed and very conspicuous ; and while the upper side is partially 
covered with small somewhat peltate scales, the under is marked with rush-coloured dots. 
