30. PELL^A, ALLOSORUS. 147 



10. P. Skinneri, Hk. ; st. 6-9 in. 1., stout, erect, straw-colour or pale-brown, 

 naked or slightly fibrillose ; fr. 6-12 in. 1., 4-8 in. br., deltoid, tripinnatifid ; 

 lower pinnce deltoid; lowest pinnl. 1-2 in. ]., 1 in. br., deltoid-acuminate, cut 

 down nearly to the rachis into broad oblong acuminate lobes ; rachis slightly 

 tornentose, both surfaces naked ; texture scarcely coriaceous ; veins fine, incon- 

 spicuous ; invol. narrow, membranous. HJc. Sp. *2. p. 141. t. 118. B. 



Hab. Guatemala ; discovered by Mr. Skinner ; and much finer specimens have recently 

 been gathered by Messrs. Salvin and Godman. 



11. P. rigida, Hk.; st. 4-6 in. 1., stout, erect, dark chesnut-brown, naked or 

 slightly scaly ; fr. 4-9 in. 1., 3-6 in. br., deltoid, bi- or tripinnate ; lowest pinnce 

 the largest, erect, patent, 3-4 in. 1., subdeltoid ; pinnl. of the lower side larger 

 than the others ; ult. segm. linear-oblong, obtuse, decurrent at the base, J-^ in. L 

 in the barren frond, 1^-2 lin. br. ; rachis naked or slightly scaly, both surfaces 

 naked or slightly hairy ; texture subcoriaceous ; veins close and fine ; sori in a 

 continuous marginal line, the broad pale wrinkled invol. rolled down tightly over 

 li.Hk. Sp. 2. p. 144. Cheiloplecton, Fee. 



Hab. Mexico, Guatemala, and said to have been also found by M. Nee in Peru. 



Allosorus, Presl. Texture coriaceous ; the veins not perceptible ; the ultimate 

 segments of the frond at least twice as long as broad, often revolute at the margin ; 

 invol. broad, conspicuous. Sp. 12-32. 



* Frond not more than bipinnately cut. Sp. 12-21. 



12. P. (Allo.) ambigua, Baker ; st. 6-9 in. 1., wiry, erect, polished, dark chesnut- 

 brown, naked ; fr. 4-6 in. 1., 2-3 in. br., oblong, simply pinnate, or bipinnate 

 at the base ; pinnce 1^-2 in. 1., 1 lin. br., linear, erecto-patent, flexuose ; texture 

 subcoriaceous, brittle ; rachis and both surfaces naked, margin incurved ; invol. 

 distinct from it, papyraceous, brown, continuous, mapped out into a series of 

 roundish depressions, the two opposite edges interlacing by a marginal fringe, 

 and sometimes concealing the dark-coloured polished midrib. Cheil., Metten. 

 Cheil. p. 49. Synochlamys ambigua, Fee, 8. Mem. t. 20. 



Hab. New Granada ; discovered by M. Schlim in 1852. 



13. P. (Allo.) atropurpurea, Link ; st. tufted, 3-4 in. 1., rigid, erect, more or 

 less tomentose ; fr. 4-12 in. 1., 2-6 in. br., varying from lanceolate and simply 

 pinnate to ovate-lanceolate, with deltoid pinnce 2-3 in. 1., with several pinnl. on 

 each side, the latter nearly sessile, 1-2 in. 1., at most J in. br., entire or sharply 

 auricled at one or both sides at the base ; texture coriaceous ; rachis tomentose 

 like the stipe ; both surfaces naked, except the costa beneath ; veins hidden ; invol. 

 formed of the slightly altered incurved edge of the pinnules, at length nearly 

 hidden by the broad line of the fruit. Hk. Sp. 2. p. 139. 



Hab. N. America, from sub-arctic latitudes southward to Texas, the Rocky Mountains, 

 and British Columbia ; and Prof. Eaton informs us it has also been gathered in the 

 South of Mexico. 



14. P. (Allo.) dura, Ilk. ; st. strong, erect, 6-12 in. 1., naked, dark chesnut- 

 brown, polished ; fr. 6-12 in. 1., 2-4 in. br., linear-oblong and simply pinnate, 

 or branched at the base with short deltoid pinnae ; segm. quite sessile, 1-1^ in. 1., 



yin. br. ; texture coriaceous ; rachis naked or slightly pubescent ; veins hidden ; 

 'i surfaces pale-green, naked ; sori broad, soon hiding the narrow membranous 

 involucre. Hk. Sp. 2. p. 139. t. 113. A. 



Hab. Mauritius, Madagascar, and discovered recently by Dr. Welwitsch in Angola at 

 3,800-5,500 ft. This and P. atropurpurca differ from all that follow by having the lower 

 pinnae pinnate. 



