426 99. FILICES. 



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. Pinnae scarcely oblique ; 

 both edges rounded and crenate except at the base, upper 

 often bluntly auricled below. /3. A. 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 pinnae deeply but irregularly pinnatifid with linear 

 botched 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 (L.); frond linear simply pinnate, pinnae stalked 

 ovate or oblong serrate unequal and wedgeshaped at the base. 

 E. B. 392. N. 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(L.}-, fronds bi^mnate, pinnules rhomboid- 

 wedgeshaped notched or toothed at the end, indusium jagged. 

 E. B. 150. N. 261. Fronds 34 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 low r ermost ternate, in- 

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

 2258. Fronds 34 in. long. Rocks, very rare. P. VI. IX. S. 



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

 elongate-lanceolate bifid. E. B. 1017. N. 269. Segments of 



