ASPLENIUM. 45 
6. pinnatum, Moore. Only once pinnate. Found near Killarney 
by Dr. Allchin. 
7. proliferum, Wollaston. In this variety young plants are formed 
on the axils of the pinnules. Found near Guildford by Dr. Allchin. 
8. ramo-depauperatum, Clapham. Branched and depauperate. 
Found at Settle by Mr. Clapham. 
9. ramosum, Moore. Branching in the upper part of the frond. 
Length, 2\ inches. Found at Arnside, by Mr. J. Crossfield ; at 
Settle, by Mr. Clapham; in County Clare, by Mr. O’Kelly. 
10. sectum, Moore. Ends of pinnules incised, producing a 
forked appearance. Found at Arnside by Mr. J. Crossfield. 
11. spathulatum, Moore. Large and spathulate. Found at Town 
Mailing, by Dr. Allchin ; Marwood, by the Rev. F. Mules ; Settle, 
by Mr. Clapham ; Dunkeld, by the Rev. R. Taylor ; and at Fife, by 
Mr. C. Howie. 
12. Striguilense, Lowe. Found at Portskewett by myself in 
1890. A dwarf robust form, with deep green fronds only 1 inch in 
length. 
13. trifidum, Moore. Dwarf, deeply divided into three cuneate 
segments. Found at Malgwyn Castle by Mr. W. Hutchinson. 
14. trifoliatum, Lowe. Dwarf. Pinnae trifoliate. Found near 
Barnstaple by the Rev. F. Mules. 
15. unilaterale, Moore. An irregular variety, with the pinnae all 
on one side of the rachis. Found near Killarney, by Dr. Allchin ; 
at Black Head, by Mr. R. Barrington ; at Chaigeley, near Clitheroe, 
by myself ; at Troutbeck, by Miss Wright ; and Kendal Fell, by Mr. 
J. M. Barnes. 
16. variabile, Moore. Pinnae and pinnules exceedingly dissimi- 
lar, pinnules very small. Found at Settle by the late Mr. Clapham. 
THE BLACK MAIDEN-HAIR SPLEENWORT. 
Asplenium Adiantum-nigrum. — Linnceus . 
The present species cannot well be confounded with any other. 
It approaches nearest to A. lanceolatum ; but the fronds are tri- 
angular instead of lanceolate, and in A. Adiantum-nigrum the sori 
are not submarginal. The stem is as long as the leafy portion of the 
frond, whilst in A. lanceolatum it is only a third the length of the 
frond. 
Fronds ovate or deltoid, bi- or tri-pinnate. Length, from 3 to 20 
inches, and varying in width in the leafy portion from 1^ inches to 
7 inches. Shining dark green. An evergreen. Rocks, walls, and 
sandy banks are its natural habitats. 
A common fern (though not abundant in Ireland). It occurs all 
over Europe. 
Varieties. 
1. acutum, Pollini. This variety has been found in a number of 
places in Ireland and on the Continent. Whilst in Northern Spain, 
in i860, I found this fern in the greatest profusion near Santander, 
Las Caldas, between Reinosa and Allar, and in the Congosto Pass, 
