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102 H V M K N O D l r j I C K l X r n 3¡.
of the frond sun-ouuded witli black hairs, and the rqipcr surface
of tbe frond covered with them.
T he sori occupies the whole of the u n d e r side of the frond
except the margin.
Rhizoma cfcspitnse, thick, and decumbent, and densely scaly.
Rachis and stipes densely covered with black hair-lik¿ scale's,
h a lf an inch in length. Stipes from six to nine inches in
length.
Veins uniform, reticulated, areoles large, elongated, and
somewhat hexagonal in form.
^ L en g th of frond from fifteen to twenty inches ; width fi'om
S IX to twelve inches. Colour dull green. Stem vcrv stout and
short.
F o r fronds of this F e rn I am indebted to Sir W . J . Hooker,
D irector of the Royal Gardens, Kew, and to Air. G No rm an ’
of H u ll.
I t may be p rocured from Alessrs. Rollisson, of T ooting; Sim,
of F o o t’s C ray ; Jackson, of Kin g sto n ; A'eitch, of Chelsea; Ik
G. Henderson, of St. Jo h n ’s AVoocl; A. Henderson, of Pine-apple
P la c e ; and Booth, of Hamburg.
The illustration is from Sir Vk J . H o o k e r’s frond.
A C R O S T I C H U M . 103
GENUS XIII.
A C RO ST ICH U A I. L in x -e u s .
S o r i amorphous, universal on the un d e r side of the fertile
frond. A'enatiou uniform, reticulated in the normal form, and
having elongated areoles. Only one species is at p resent in
cultivation in this country.
T’he section Pcecilopteris differs in having the venation pinnate
and the venules arcuately or angularly anastomosing. Fronds
¡^innate.
The section Gtjmnop>teris differs in the pinnate veins having
the venules compoundly anastomosing. Fronds simple, lobed,
or pinnate.
T he section Polyhotrya has the veins pinnate and the venules
simple, free, and external. Fronds bi-trlpinnate.
T h e section Elaphoglossiim has simple fronds. The veins
simf>lc or forked, and in te rn a l; the venules parallel, their
apices being free and clavate, terminating within a thickened
margin.
The section Lomariopsis has the veins uniform, simple, or
forked. Fro n d s pinnate.
T h e re are no British representatives.
Air. Aloore, in his “ Genera and Species of Cultivated F e rn s ,”
gives—
Elaidioglossum confonne, Schott.
“ crassinerve, Kunze.
“ calhcfolium, J. Smith.
“ longifolium, J. Smith.
“ scolopendrifolium, J. Smith.
“ villosura, J . Smith.
“ dombcyanum, Fee.
P olybotrya cylindrica, K a u lfu s s.
Acrosticlium aureum, Linnceus.