DICKSONIEiE. 



11 



DICKSONIE^E. 



In this tribe of Ferns Sir W. 



Dicksonia, 51 species. 



Cibotium, 6 " 



Deparia, 2 " 



Loxsoma, 1 



Hymenophyllum, 85 " 



Mr. Smith, in his "Catalogue 

 enumerates — 



Hooker enumerates — 



Trichomanes, 87 species. 



Davallia, 112 



Lindsaea, 60 " 



Dictyoxyphium, 1 " 



of the Ferns grown at Kew," 



Lindsaea, 

 Schizoloma, 



2 species. 

 1 



Deparia, 

 Trichomanes, 



1 species. 

 3 



Dictyoxyphium, 

 Humata, 



1 



2 



Hymen ophyllum, 

 Sitolobiuin, 



3 

 5 



Davallia, 



10 



Balantium, 



1 



Leucostegia, 



2 " . 



Dicksonia, 



4 



Odontosoria, 



2 



Cibotium, 



2 



Microlepia, 



4 



Thyrsopteris, 



1 



The several families of the tribe Dicltsoniece have the spo- 

 rangiferous receptacles terminal, marginal, or punctiform, or 

 when several are combined, linear-elongated. The indusium is 

 lateral, and attached interiorly, the exterior margin being free, 

 and usually conniving with the opposite portion of the margin, 

 (which is changed in texture,) forming a bivalved or tubular 

 groove, in which the sporangia are situated. 



Amongst these Ferns are some of the most pigmy on the 

 one hand, and some of the most gigantic on the other. 



Sir W. J. Hooker describes above four hundred species, and 

 of these only three are inhabitants of Great Britain and Ireland. 



