125 



7. Llavea, Lagasca {not Liebm.). 



Ceratodactylis,/.>S'?;2. (Hook. Gen. Fil. tab. XXXVI.*) 

 Allosorus, Kze. Botryogramme and Ceratodactylis, Fee. 



Sterile and fertile pinnules different on the same plant. 

 Sori linear or oblong, occupying nearly the whole length of 

 the pinnated veins of the upper pinnules of the frond which 

 are much altered and elongated, siliquiform. Involucre 

 formed by the incurved, continuous, membranous, dilated 

 margins of the pinnules, covering and concealing the fructi- 

 fications (as in Cryptogramme), — A solitary species oi Mexico. 

 Caudex short, thick, and, as ivell as the loiver part of the long, 

 flexuose, straw-coloured stipes, scaly. Frond ample, 5-pinnate ; 

 rachises flexuose, slender. Sterile pinnules ovato-cordate, 

 thin, but subcoriaceous, firm, the veins closely jnnnated, forked, 

 slender, prominent, the margin cartilaginous finely spinuloso- 

 serrated, fertile pinnules confined to the upper portion [and 

 forming a panicle), narrow, elongated, nearly terete, acumi- 

 nated, less rigid than the sterile pinnules : tlie margins mem- 

 branaceous, involute, and forming the involucres, finally 

 spreading. 



This is in every respect a very striking plant, closely allied in its fructifications 

 to Cryptogramme, Br., but with a very dilferent habit, in some respects approach- 

 ing Osmunda. It is this peculiar habit mainly that justifies the separation from 

 Allosorus or Pellcea. 



1. LI. cordifolia, Lagasca, Gen. et Sp. PI. 1816, p. 33; 

 Diet, des Sc. Nat. xxvii. p. 89. Ceratodactylis osmundioides, 

 /. Sm. in Hook. Gen. Fil. t. 36. Fee, Gen. Fit. p. 228. Allo- 

 sorus Karwinskii, Kze. in Linn. xiii. p. 138. Benth. Plant. 

 Hartiv.p. 54. Kze. in Schkuhr, Fil. Suppl. p. 7, t. 4. Hook. 

 Ic. Plant. Rar. iv. /. 387 ct 388. Botryogramme Karwinskii, 

 Fee, Gen. Fil. p. 166, t. 15 C. 



Hab. Mexico, Lagasca, Heboid, Liebmann ; Oaxaca, Kai-wmsA/, Galeotti, elev. 

 5-7000 feet ; Barranca de la Encarnacion, near Zimapan, Hartweg, Dr. Coulter, 

 n. 1684 ; Amatenango, Chiapas, Linden, n. 1522 ; Sierra San Pedro Nolasco, Talea, 

 etc., Jurgensen, n. 080. 



Having, after the fullest consideration, deemed the present fine plant worthy 

 of forming a genus, distinct from Allosorus, to which I had been disposed to re- 

 fer it, the next step was to consider the priority of name for the genus ; and it 



* In this figure of Mr. Bauer, as observed by Mr. J. Smith, the fold of the 

 involucre has been mistaken for an additional receptacle, and represented accord- 

 ingly. 



VOL. II. S 



