BLECHNUM. 



79 



GENUS X. 



BLECHNUM. Linn^us. 



Fronds either simple, pinnatifid, or pinnate. Pinnae adherent, 

 or articulated with the rachis. Veins forked, those of the fertile 

 fronds combined near their base at the point of forking by a 

 transverse vein, and forming the sporangiferous receptacle, mostly 

 situated near the midrib. 



Fertile fronds not contracted. 



Sori linear, mostly continuous, yet sometimes interrupted. 



All natives of warm climates, and easily cultivated. 



Length of fronds from six inches to six feet. 



There is no British example. 



Presl, in his "Tentamen Pteridographiae," gives the following: — 



Blechnum lanceola 

 trifoliatum 

 unilaterale 

 glandulosum 

 Pohlianum 

 asplenioides 

 triangulare 

 distans 

 longifolium 

 auriculatum 

 integerrimum 

 procerum 

 scandens 

 Brasiliense 



Blechnum radiatum 

 " Finlaysonianum 

 " cartilagineum 

 " caudatum 

 " meridionale 

 " Australe 

 " rigidum 

 *^ occidentale 

 " ciliatum 

 " stramineum 

 " orientale 

 " latifolium 

 ^' ambiguum 

 " Fontanesianum 



Blechnum trilobum 

 " hastatum 

 " remotum 

 *' gracile 

 '^ silicifolium 

 " angustifolium 

 " serrulatum 

 " fraxineum 

 " appendiculatum 

 " elongatum 

 " pectinatum 

 '^ striatum 

 *^ volubile 

 '^ flabellatum 



Fee, in his "Genres de la Famille des Polypodiacees,' 

 merates the following: — 



enu- 



Lanceola, Swartz. 

 Unilaterale, Willdenoio. 

 Heterocarpon, Fee. 



VOL. TV. 



Asplenioides, Stoartz. 

 Glandulosum, LinJc. 

 Meridionale, Presl. 

 M 



