WOODSIA.—LASTREA. 409 
fore referred this and the following to Polystichum. Newman 
places them in Lastrea.—Damp places, loving th f water- 
falls. P. VII.—IX, sg onan Mer 
3. P.? Dryopteris (L.); fronds ternate glabrous, divisions pin- 
nate, pimnz pinnatifid obtuse the uppermost nearly entire, sori 
marginal.—H, B. 616. N.123.—Rhizome black, wiry, creeping, 
slightly scaly. Stalk slender, brittle. The three divisions of the 
frond loosely spreading, the middle one rather the largest. Ver- 
nation resembling 3 little balls on wires. Not at all glandular. 
~—Shady mountamous places. P. VI. VII. 
4. P.? calcareum (Sm.); fronds triangular subternate glandu- 
dar-mealy, lower branches pinnate, pinnz pinnatifid obtuse the 
uppermost nearly entire, sori marginal— FH. B. 1525. N. 131. 
P. Robertianum (Hoffm.) Koch.—Very different in habit from the 
preceding and always covered with very minute stalked glands 
giving a mealy character to the surface. Frond not so decidedly 
3-fid, the lower branches being much smaller in proportion to the 
middle one ; all the 3 erect, rigid—On broken limestone ground. 
P. VII. VIII. E. 
3. Woonstia R. Br. 
1. W. ilvensis (R. Br.) ; frond lanceolate or oblong pinnate 
hairy beneath.—N. 137 and 147.—Our plants seem to me to 
form only one species although they present 3 different appear- 
ances, viz.—. tlvensis ; fronds lanceolate, pimnz oblong deeply 
lobed or pimnatifid blunt, lobes ovate crenate. W. ilvenses 
E. B.S. 2615. In the continental plant the pinne are narrowed 
from the base and rather acute.—. gracilis; frond linear-lan- 
ceolate, pinne triangular pinnatifid, lobes 5—9 oval entire or the 
lowest crenate. W. hyperborea EB. B. 2023, Tausch! Pol. hyp. 
B. gracile Wahl.—y. alpina ; fronds oblong, pinnz triangular-oval 
lobed, lobes 3—5 rounded very blunt. Pol. hyperboreum Wahl. 
Acrost. alpinum Bolt. t.42.—A very small plant; fronds 1—3 in. 
long, hairy and scaly. Rhizome tufted.— Exposed alpine rocks, 
very rare. «. Glyder-Fawr, N. Wales. Falcon Clints, Teesdale, 
Durham. £8. Ben Lawers. Mr. Dickson! y. Ben Lawers. Mr. 
W. Wilson! Clogwyn y Garnedd, Snowdon. P. VII. E.S. 
Tribe II. Aspidiee. 
4. Lastrea Presi. 
1. L. Thelypteris (Presl) ; fronds pinnate, pinne linear-lanceo- 
late pinnatifid slightly downy but without glands, lobes oblong 
with revolute edges, sori submarginal.— Aspidium Sm., N. 183.— 
Earlier fronds barren, later fertile, lanceolate, 2 or 3 lowest pairs 
T 
