206 89. POLYPODIACE,E. 



B. LASTREA. Tndusium orbicular-reniform, attached by the 

 sinus. 



3. L. OREOPTERIS, Sw. Heath Shield-fern, Mountain-fern. 

 Ehizome tufted. Stipes short. Fronds erect, 2 3 ft. high, 

 pinnate ; pinnae linear-lanceolate, pinnatifid, becoming gradually 

 smaller from the middle of the frond to the base ; segments entire, 

 obtuse, glandular beneath. Sori confined to the margin of the 

 segments. Indusium very small. Colour yellowish green ; fragrant 

 when bruised. 



Very common. Heaths and mountain pastures. (B) P. 7. Cathkin hills; 

 Calderwood glen; on all the hills bordering the Firth. 



4. L. FILIX-MAS, Sw. Male-fern. Rhizome slightly decum- 

 bent or nearly erect. Stipes densely scaly. Fronds growing in 

 circular tufts, bipinnate; pinnae linear-lanceolate; pinnules obtuse, 

 with a broad base, serrated or incised and toothed, but not spinu - 

 lose ; rachis covered with brown scariose scales. Sori confined to 

 the upper half of the frond. 



Very common. Shady banks and woods. (B) P. 67. 



Var. incisa, Moore. Pinnules wide apart from each other, 

 oblong-lanceolate, rather deeply incised, with a slight auricle at 

 the base, fronds taller and of more erect growth than the former. 

 Frequent. In the woods around Glasgow. 



Var. producta, Moore. Fronds upwards of 3 ft. high. Pinnules 

 elongated, gradually tapering to a point, deeply pinuatifid and 

 lobed, the lobes serrated ; basal pinnules cut more than half way 

 down to the midrib, attached by a short stalk ; altogether a finer 

 and more completely developed state of incisa. 

 Frequent in woods ; Garscube; Cadder wilderness ; Gourock; Bute and Arran. 



Var. paleacea, Moore; Borreri, Newm. Very rigid, and densely 

 scaly on the stipes, rachis, and veins of the pinnules. Indusia 

 with the edges incurved. 



Frequent. In Cumbrae and Arran. 



5. L. CRISTATA, Sw. Crested Shield-fern. Stipes scaly. Fronds 

 erect, glabrous, 1 2 ft. high, linear-lanceolate, pinnate; pinnae 

 elongate -triangular, pinnatifid, segments curved towards the apex 

 of the pinna, crenate, with mucronate teeth. Sori large ; indusium 

 flat, entire. 



Very rare. In boggy heaths. (E) P. 8. Bog beyond Crofthead. 



6. L. DILATATA, Sw Broad Prickly Shield-fern. Stipes long, 

 covered with lanceolate, acuminate scales, brown in the centre. 

 Fronds 2 5 ft. high, ovate-lanceolate or subdeltoid, bi- or 

 tri- pinnate, lowest pinnae sub-deltoid, unequally pinnate, this 

 inequality gradually disappearing until about the middle of the 



