J. SMITH ON THE GENERA OF FERNS. 169 



Examp. 1. C. pteroides, Sw, 2. C. capensis, Sw, 3. C. 

 radiata (Adiantum, Linn., Sw., Willd.) 4. C. odora, Sw. 

 5. C. fragrans, Sw. 6. C. viscosa, Link. 7. C. spectabilis, 

 Kaulf. Illust. Hook, gen.fil. ined. Plum.Jil. t. 100. 



Obs. The technical distinction between this and tlie fol- 

 lowing genus depends in a great measure upon the ultimate 

 segments or laciniae of the fronds of Cheilanthes being more 

 crenate and sinuous than in the greater number of the spe- 

 cies of Cassebeera, which genus is characterized with a con- 

 tinuous indusium and this happens by the margin being 

 straight or but slightly sinuous, but there are instances of 

 the indusium of some species of Cheilanthes, including more 

 than one sorus which clearly shows that the two genera are 

 in that respect scarcely distinct. 



52. Cassebeera, Kaidf. J. Sm. 

 (Allosorese sp. Presl.) 



Veins forked ; venules direct, their apices free and sporan- 

 giferous. Sori round, distinct, or contiguous and confluent, 

 constituting a linear continuous or interrupted compound 

 'marginal sorus. Indusium linear, plane, plicate or vaulted. 



¥ronds palmate, pinnate, bipinnatijid or bi-tripinnate, smooth 

 or squamose, rarely farinose ; stipes rigid and ebeneous; pinnae 

 usually articulated with the rachis. Indusium attached trans- 

 versely across the sporangiferous apices of the venules, sometimes 

 very narrow, rarely slightly intramarginal and conniving with 

 the opposite sorus. 



Examp. 1. C. triphylla, Kaulf. 2. C, pedata (Pteris, Linn.) 

 3. C. argentea (Pteris, Linn.) 4. C. farinosa (Pteris, Stv.) 

 5. C. inframarginalis (Pteris, Kaulf.) 6. C. pinnata, Kaulf. 

 7. C. hastata, (Pteris, Sw.) 8. C. cuneata (Cheilanthes, 

 Kaulf.) 9. C. microphylla (Cheilanthes, i?wA.) 10. C. ten- 

 uifolia (Cheilanthes, Sw.) Illust. Hook, gen.fil. t. 66. A. 



Obs. On comparing the Adiantoid section of Pteris, and 

 part of Cheilanthes with the original species of Cassebeera, I 

 find that several of the species of both these genera so well 

 agree in habit and structure of the sori, that I have been in- 



