194 MR. D. OLTVER’S NOTES ON THE BRITISH 
distant below.  Pinnules (basal ones of second раг of pinnse) 1] inch 
long, shortly stalked, pyramidal or pyramidal-ovate, acute, pinna- 
tifidly divided nearly to the costa, almost pinnate; lobes oblong, 
obtuse, about 2 inch long, the lowest ones sublobate at their base, 
otherwise toothed or serrated; the serratures most numerous and 
prominent at the apex, acute and mucronulate. The pinnules become 
gradually less pyramidal or ovate, and more oblong, at length linear- 
oblong as they recede from the main rachis; below, except in the 
case of the lowest, they are also sessile with a narrowed attachment, 
but become gradually more and more adnate upwards. The pinnules 
of the upper pinnz resemble the smaller pinnules of the lower ones. 
Venation in the larger lobes, consisting of a flexuous primary vein or 
costule, from which alternate veins proceed towards the serratures of 
the margin, sometimes becoming branched; the sori are situated 
medially on the simple veins, and close above the fork on the branched 
ones. In the smaller pinnules the costule bears a sorus medially on 
its lowest anterior vein, so that a row of sori are formed on each side 
of and near to the costa; the basallobes often bear in addition two 
or three more sori, and are traversed by a series of alternate simple 
veins. Fructification occupying the whole back of the frond from the 
base to the apex. Sori prominent, distinct, biserial near the costa of 
the pinnules, and in the larger ones biserial on the lobes. Indusium 
persistent, reniform, obscurely eroso-dentate on the margin, not 
glandular. 
Notes upon the British Herbarium of the Linnean Society. 
By Danie OLiv¥R, jun., Esq., F.L.S. 
[Read Dec. 15th, 1859.] 
Ir has occurred to me that, from the interest felt in British 
Botany by many members of the Linnean Society, it might not 
be amiss to present, in the form of a little notice, in the ‘ Journal 
of Proceedings,’ a short account of the Herbarium devoted to our 
own Flora, upon which, at the request of the Herbarium Com- 
mittee of the Council, I have been engaged, at intervals, within 
the past two years. 
That the formation of such an Herbarium was contemplated, 
and had indeed considerably progressed, may be gathered from 
the allusion to it in a late Anniversary Address of our President*, 
and from its cursory mention in the published ‘ Minutes of Pro- 
ceedings.’ It has not hitherto, however, been thought needful or 
desirable to appeal to Fellows for assistance in the contribution of 
* Journal of Proceedings, vol. iii. p. xx., 1858. 
