8o 



SYNOPSIS OF THE GENERA OF PTERIDOPHYTES*. 



[The figures in brackets indicate the number of species in S. A.] 



Fam. i. Ophioglossaceae. 



(Fig. 47.) (5) 1. Ophiogl6ssum 



Fam. 2. M arattiaceae. 



(1) :. Marattia 



Fam. j. Os 111 u 11 d aceae. 



A. Fertile pinnae almost devoid of lamina. 



(1) 3. Osmunda 



B. Sori on the hack of ordinary pinnae. (Plate 8 ; Fig. 48.) 



(1) 4. T6dea 



Fam. 4. Schizaeaceae. 



A. Fronds without lamina, rigid and wiry, the fertile segments crowded 



at the apex into a comb-like body. (Fig. 49.) 



(3) 5. Schizaea 



B. Fronds pinnately divided. Fertile part of frond distinct, without 



lamina, much branched, rising from the base of the leaf}' barren 

 frond. 



(3) 6. Aneimia 



C. Sporangia marginal or nearly so, on ordinary fronds. (Fig. 50.) 



1 species only, M. caffrorum. 7. Mohria 



I). Scandcnt. Fronds alternate, dichotomous near the base. Sporangia 

 in spikes along the edges of ordinary or modified fronds or parts 

 of fronds, each one separate in the axil of an almost marginal, 

 infolded involucre. The involucre of each sporangium imbricating 

 over that next above it. (Fig. 49.) 



(2) 8. Lyg6dium 



Fam. 5. Gl ei ch en i aceae. 



"The Creeping hern." (Plate 8; Fig. 51.) 



(3) 9. Gleichenia 



Fam. 6. Polypodiaceae. 



A. Sori furnished with an involucre or iiulusium. 



</. Iiulusium covering the sorus (at least when young) and opening 

 towards the margin or the frond. 



I. Sorus marginal, roundish. Iiulusium attached at the base and at 

 the sides, being open only at the outer edge. 



(4) 10. Davallia 



* By T. R. Sim, F.L.S. 



