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genus 41 . Fronds simple or incised, the segments 

 adnate, confluent, not articulate at the base. 



GENUS 426. SCHIZOSTEGE. Sori and indusia ter- 

 minal on the veins, marginal, solitary on "["-shaped 

 expansions or uniting the fork branches of the 

 veins. Fronds divided; segments not articulate. 



GENUS 43. HISTIOPTERIS. Sori and indusia oblong or 

 linear. Fronds compoundly divided ; lowest pinnulae 

 short, close to the main rachis, stipule-like ; leaflets 

 not articulate at the base. . 



GENUS 44. ONYCHIUM. Sori and indusia as in genus 

 43. Fronds finely dissected; ultimate segments 

 narrovvr, with the sori and indusia (which are 

 occupying both sides of the segments) reaching 

 nearly or quite to the midrib ; leaflets not articulate 

 at the base. Spores globose to tetrahedral. 



GENUS 4Ba. PTERIS. Like genus 44, but the fronds 

 not finely dissected, the ultimate segments broader 

 with the sori and indusia not reaching the midrib. 

 Stipes with a single V' o^" IJ-shaped vascular 

 strand. 



GENUS 456. HEMIPTERIS. Like genus 45a, but the 

 sori occupying only the posterior edge of the ul- 

 timate segments, the anterior side destitute of sori. 



« 



GENUS 46. PAESIA. Like genus 45a, but the indu- 

 sia 2-valved and the spores 2-lateral. 



GENUS 47. PTERIDIUM. Like genus 46, but the inner 

 valve of the indusium sometimes obsolete, the 

 spores as in genus. 44. Stipes with many/lrre- 

 gularly placed vascular strands. 



