922 OBSERVATIONS ON THE 
for it, but I cannot agree therewith. The G. vulcanica is most surely 
dichotomous, and the pinne likewise. 
Gleichenia longissima, Bl., belongs not to the Eugleichenie, but to the 
Mertensia, and is so nearly related to G. excelsa, J. Sm., that I almost 
doubt if the latter should remain separated. The second variety of 
G. longissima, Bl., ought to form a new species, which I had called in 
manuseript Mertensia arachnoides, Usskl.; gigantea, pinnis oppositis 
elongato-sublineari-oblongis, rhachi complanata emarginata dense cano- 
tomentosa et hinc inde et preprimis subtus paleis minutis adpressis 
munita, pinnulis lineari-lanceolatis acuminatis tune subfaleatis alternis 
profunde pinnatifidis coriaceis subtus glaucis, utrinque proprimis autem 
subtus arachnoideo-ferrugineo-lanuginosis supra mox glabratis nitidis 
subtus dein subglabratis, laciniis margine cristeeformi coste solummodo 
junctis linearibus obtusis vix acutiusculis, margine integerrimo revo- 
luto, venis furcatis, soris superficialibus crebris e sporangiis 1-4 con- 
formatis.—(Stipites 63 ped. alt.; frondes incomplete evolute 4 pinnas 
solummodo gerentes, 6 ped. longæ, 3-33 ped. late ; pinna 2 ped. longa, 
fere 1 ped. lata.) 
Cyathea arborea, Sm., the essential character of which, you observe, 
may be looked for in the firm texture and beautiful regular margin of 
the cup-shaped involucre or age; grows also on the declivity of the 
Gedeh and Lawu, at the height of 5000 feet. Justly you have united 
the Disphenia with the Cyathea, and I wonder that Kunze, in Zollinger 
. Verz. Herb. No. 2538, has revived that genus, making of this plant 
_ the Disphenia orientalis. 1 am in possession of a specimen of Zollinger, 
signed by his hand “ Cyathea crenulata,” a quite different species. 
this and the other arboreous Ferns I have preserved the whole plant, 
. being for the most part of them in possession of complete fructiferous 
fronds and stems, which I could investigate in a fresh state. 
E To C. spinulosa, Wall., I must refer a variety 8, muriculata, rhachi 
et stipitis apice muriculatis (nee spinulosis) ; here too belongs C. poly- 
Sopa: Jungh., a, elongata, Jungh. Flora, 1847, p. 522. 
coe C. oinops, Hsskl.; arborea, alta, stipitibus brevibus punetulato-asperis 
basi paleaceis cæterum cum rhachi tomento vineo denso stellato tectis 
 subteretibus supra suleatis castaneis, fronde ovali-elliptica utrinque 
acuta adiac tripinnatifida, pinnis oblongis acutis, pinnulis lineari- 
oblongis acutis profunde (ad apicem sterilem et sterilibus minus pt 
funde) crenato-serratis, margine reyoluto, supra e venis furcatis, basin 
