138 ENGLISH BOTANY. 



and A. Trichomanes ; Hiiter, a hybrid between A. Ruta-muraria and 

 A. Trichomanes ; but there seems no ground for regarding the plant as 

 anything but a true species. Although scarce in Britain, it is not so 

 on the continent, and is found over the whole of Europe. Accord- 

 ing to Milde, it is common in Silesia and the Tyrol, and he has 

 seen it in many places, not in company with A. septentrionale or 

 A. Trichomanes or A. Ruta-muraria. 



Alternate-leaved Spleenwort. 



SPECIES X.-ASPLENIUM SEPTENTRIONALE. Hull. 



Plate 1882. 



Babenh. Crypt. Vase. Europ. Exsicc. No. 61. 



Acrostichum septentrionale, Linn. Spec. Plant. 1524. 



Acropteris septentrionalis, Link. Babenh. 1. c. No. 61. 



Amesium septentrionale, Newm. Hist. Brit. Ferns, ed. ii. p. 10, and ed. iii. p. 265 ; and 



Phyt. 1851, App. p. vii. 

 Scolopendrium septentrionale, Both, Fl. Germ. Vol. III. p. 49. 



Caudex short, divided into several closely packed scaly crowns ; 

 scales subulate, acute, entire or with stalked glands. Fronds several 

 from each crown, ascending. Stipes wiry, longer than the lamina, 

 generally twice or thrice and sometimes four times as long, purplish- 

 brown for about J of its length from the base, green in the upper 

 half, channelled above, clothed with numerous cylindrical unicellular 

 hairs, especially towards the base. Lamina very thick, coriaceous, 

 opaque, dim, evergreen, wedgeshaped and once or twice forked or 

 laciniate, or linear and undivided ; segments linear or strapshaped- 

 linear, tapering towards the base and apex, very narrowly wedge- 

 shaped at the base, and very acute at the apex, entire or with one 

 or two narrow ascending secondary segments, and usually with one 

 or two long teeth at the apex. Rachis green, not winged. Segments 

 and secondary segments without any mid-vein ; veins few, forked, 

 parallel. Sori linear, parallel, nearly covering the lower surface of 

 the segments, ultimately confluent. Indusium quite entire. Spores 

 tuberculated, with rather small subacute tubercles. 



On rocks and walls. Rare and local. Between Chudleigh and 

 Dartmoor, South Devon, Rev. W. M. Rogers ; North Devon, Rev. 

 W. S. Hore ; Porlock, Somerset, Miss Edmunds ; several places in 

 North Wales and the lake district ; Ingleborough, Yorkshire ; Kyloe 

 Oraigs, Northumberland. Minto Craigs, Roxburgh ; Arthur's Seat 

 and Blackford Hill, Edinburgh ; Stenton Rock, near Dunkeld, Perth ; 



