318 COMMON PLANTS. 
Poa pratensis, Z., 18, Sh. F. I. L. Hordeum pratense, Huds., 12. 
Poa trivialis, Z., 18, Sh. F. Nardus stricta, Z., 18, Sh. 
Poa nemoralis, Z., 16, I. Polypodium vulgare, L., 18, Sh. 
Briza media, Z., 18. Aspidium aculeatum, Sw., 16. 
Cynosurus cristatus, Z., 18, Sh. 6. lobatum, Sw., 17. 
Dactylis glomerata, Z., 18, Sh. F. I. Lastrea Oreopteris, Pres?, 18, Sh. 
Festuca bromoides, Z., 17. Lastrea Filix-mas, Pres/, 18, Sh. L. 
Festuca ovina, Z., 18, Sh. F. I. L. Lastrea dilatata, Pres/, 18. 
Festuca duriuscula, Z., 18, Sh. Athyrium Filix-foemina, Rh., 18, Sh. L. 
Festuca pratensis, Huds., 18, Sh. F. Asplenium Trichomanes, Z., 18. 
6. loliacea, Huds., 15. Asplenium Adiantum-nigrum ?, 18. 
Festuca elatior (doubtful sp.), 15. Asplenium Ruta-muraria, Z., 18. 
Bromus giganteus, L., 16. Scolopendrium vulgare, Sym., 18, Sh. 
Bromus asper, Z., 16. Blechnum boreale, Sw., 18. 
Bromus sterilis, Z., 15. Pteris aquilina, Z., 18, Sh. 
Bromus secalinus, Z., 16, L. Lycopodium clavatum, Z., 18. 
Bromus commutatus, Schrad., 16, Sh. Lycopodium Selago, 18. 
Bromus mollis, Z., 18, Sh. Equisetum arvense, Z., 18, L. 
6. racemosus, L, ? Equisetum sylvaticum, Z., 18. 
Brachypodium sylvaticum, Beauv.,18,I. Equisetum palustre, Z., 18, L. 
Triticum caninum, Huds., 15. Eqguisetum limosum, Z., 18. 
Triticum repens, Z., 18, Sh. F. L. b. fluviatile, Neewm. 
Lolium perenne, Z., 18, Sh. L. e. fluviatile, Fr. 
Diagnostics of Polystichum aculeatum and angulare. 
The following description is intended to illustrate about the 
middle of a frond of the normal fully developed growth of the 
plants under consideration. 
PoLysTICHUM ACULEATUM—LOBATUM.—The latter name is ap- 
plied to the exposed or subalpine form. This species is the more 
rigid of the two; it is more erect, robust, and fleshy, the frond 
more linear and less drooping in its mature state, than its con- 
gener. The scales are less numerous, and generally darker and 
shorter. The small pedicle, or footstalk, which connects the pin- 
nula with the pinna is much stouter than in P. angulare, and 
more inclined to be decurrent. There is but little or no rotun- 
dity at aA on the posterior side* of the pinnula, and its angle 
B with the apex of the pinna is more acute, as shown in the 
accompanying diagram. The angle also of the pinna at c 
* Posterior with reference to the pinna. 
