408 MESSRS. C. B. CLARKE AND J. G. BAKER ON 
P. cayennense, Lam., mentioned by Doell (in Mart. Flora Brasil., 
Gram. pp. 127, 128, in nota), in which species Doell has noticed 
an extra flower. In these cases, however, the redundant flower 
occurs only exceptionally, causing the spikelets to look “ double.’ 
In P. supervacuum the spikelets are closed, not more turgid than 
those of P. prostratum. It may be suggested that P. super- 
vacuum is a state of P. prostratum, Lam. (or one of the nume- 
rous closely allied species thereto), arising from cultivation or 
accident. To this I reply that no Panicwm of this group 18 
cultivated in India, so far as I know; and that I have col- 
lected P. supervacuum both in the Terai of Sikkim and near 
Moorshedabad. The uniformity of structure of the spikelets 
throughout these examples has caused me to treat itas a species, 
of which I append a technical description, using (as throughout 
this paper) the terminology of Kunth. 
Panicum SUPERYACUUM. Culmi 3-4 dm. longi, ramosi, Va- 
gantes. Folia 7 cm. longa, 8 mm. lata, basi truncata, in utraque 
facie pilosa ; ligula ex annulo pilorum constans. Panicula 1 dm. 
longa, laxa; rami 4-5 cm. longi, distantes, lineares, parum divisi. 
Spicule 8 mm. longs, irregulariter sparse, ssepe geminatte (altera 
sessilis, altera pedicellata); pedicelli minute pilosi, sub glumis 
articulati. Glums (cum flore inferiore) pilose: inferior cum i 
parte superioris equilonga. Flos imperfectus (1- vel 2-paleatus) 
supervacuus inter florem masculum et florem perfectum inter- 
positus.—Species P. prostrato, Lam., similis. 
Hab. Bengalia, C. B. Clarke, nn. 35108, 33585, 36932. 
Supplementary Note on the Ferns of N rthern India. 
By C. B. Crarke, F.L.S., and J. G. Baer, F.L.S. 
[Read 3rd November, 1887.] 
J. G. Baker has been looking through the miscellaneous collec- 
tion of Ferns which C. B. Clarke has lately brought from Northern 
India, and selecting therefrom such specimens as he wishes to 
have pasted down in the Kew Herbarium. It has been the prac 
tice of J. G. Baker, in similarly picking over fern collections for 
