426 99. riLicES. 



vided much shorter than the stipes, pinnae and pinnules lanceolate- 

 attenuate, ultimate subdivisions very acute, clusters long. — N. 

 ed. 3. 231. — I have no acquaintance with this plant. — South- 

 west of Ireland, plentiful. P. VI.— IX. I. 



3. A. Adiantum-nigrum (L.) ; fronds ovate-triangular twice 

 or thrice pinnate about as long as the stipes, pinnae and pinnules 

 triangular, ultimate subdivisions blunt sharply toothed, clusters 

 long central. — E.B. 1950. N. 255. — Clusters 2 or 3 times as long 

 as in the preceding, placed near the midrib and ultimately con- 

 fluent in oblong masses often covering the whole under surface 

 of the pinnule. — Rocks and walls. P. VI. — IX. Black Spleen- 

 wort. 



4. A. Trichomanes (L.); frond linear pinnate, pinnae roundish- 

 ovate crenate, veins forked below the clusters. — E. B. 576. 

 N. 285. — Rachis black, keeled beneath. Pinnje scarcely oblique ; 

 both edges rounded and crenate except at the base, upper 

 often bluntly auricled below, — /3. J. anceps (Sol.?); pinnae ob- 

 long blunt wedgeshaped below upper edge and end crenate-den- 

 tate lower entire. Pinnae oblique, lower edge nearly straight ; 

 lower pinna much the smaller. — A curious variety is occasionally 

 found with its pinnas deeply but irregularly pinnatifid « ith linear 

 notched segments. — Rocks and walls. /3. Killarney. P. V. — X. 

 Common Spleenwort. 



5. A. viride (Huds.) ; fronds linear pinnate, pinnae roundish- 

 ovate or rhomboidal crenate, veins simple or forked beyond the 

 sori.—E. B. 2257. N. 281.— Rachis green, not keeled. Sori 

 at length confluent. — Rocks on mountains. P. VI. — X. 



6. A. marinum (Jj.); frond linear simply pinnate, pinnae stalked 

 ovate or oblong serrate unequal and wedgeshaped at the base. — 

 E. B. 392. JV. 275. — Varying greatly in size. Sori not confluent. 

 — Maritime rocks. P. VI. — X. 



** Ultimate subdivisions without a distinct midvein. 

 Amesium Newm. 



7. A. Ruta-muraria(h.) ; fronishrpmnBie, pinnules rhomboid- 

 wedgeshaped notched or toothed at the end, indusium jagged. — 

 E.B. 150. IV.261.— Fronds 3— 4 in. long.— Rocks and old walls. 

 P. v.— IX. Wall Rue. 



8. A.germanicum (Weiss) ; fronds simply and alternately pin- 

 nate, pinnules narrow-wedgeshaped the lowermost ternate, in- 

 dusium entire at the edge. — N. 265. A. alternifolium Sm., E. B. 

 2258.— Fronds 3—4 in. long.— Rocks, very rare. P. VI.— IX.— S. 



9. A. septentrionale (Hull); fronds 2- or 3-eleft, segments 

 elongate-lanceolate bifid.— £. B. 1017. N. 269.— Segments of 



