﻿COMPENDIUM. XXVII 



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 ~f -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 ; lovs^est 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 linely dissected; ultimate segments 

 narrow, w^ith 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 45a. PTERIS. Like genus 44, but the fronds 



tf not finely dissected, the ultimate segments broader 



with the sori and indusia not reaching the midrib. 



Stipes with a single \/' o^' t_J-shaped vascular 



strand. 



GENUS iU. 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, irre- 

 gularly placed vascular strands. 



