194 MB. D. OLTYEB's notes on the BRITISH 



distant below. Pinnules (basal ones of second pair of pinnae) Ij inch 

 long, shortly stalked, pyramidal or pyramidal-ovate, acute, pinna- 

 tifidly divided nearly to the costa, almost pinnate; lobes oblong, 

 obtuse, about | 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 pinnaj 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 basal lobes 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 Daniel Oliver, jun., Esq., F.L.S. 



[Read Dec. 15th, 1859.] 



It 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 Plora, 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 w^as 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 Pellows for assistance in the contribution of 



* Jounial of Proceedings, vol. iii. p. xx., 1858. 



