XXII COMPBNDHJM. 



GENUS 8. HYMENOPflYLLUMl, Indusium more or 

 less deeply 2-valved. ^uFface of the sporangium 

 divided into many ± equalj cells. 



GENUS 9. TRICHOMANES. Indusium tubular orfun- 

 nel-staped, the mouth entire or 2-lipped. Surface 

 of the sporangium divided into few^ unequal cells. 



FAMILY V. SCHIZAEACEAE Ring complete, horizontal, crovrning 

 the apex of the sporangium like an operculum. 



GENUS 10. LYGODIUM. Sori consisting of 1—2 spo- 

 rangia placed in the axils of 2 rovrs of clasping, 

 imbricating indusia. Fronds long and twining. 



GENUS 11. SCHIZAEA. Sori linear, consisting of 2— 4 

 rows of sporangia. Indusium wanting. Fronds small 

 and erect. 



FAMILY VI. ' POLYPODIACEAE. Ring incomplete, vertical, the ex- 

 tremities sometimes separated by the stalk of the sporangium 

 only. Sori definite or indefinite, but then closely crowded over 

 the parenchyma. (Ring sometimes as in Family I, but then the 

 sori and indusia linear and the caudex not arborescent). 



Indusiatae. Indusium present. 



Tribe I. Woodsieae. Sori roundish or linear-oblong. In- 

 dusium globose, cupuliform or sausage-shaped, fastened 

 all round the receptacle or apparently so in genus 13. 



GENUS 12. DIACALPE. Indusium globose, bursting 

 down irregularly. Veins free. 



GENUS 13. DIPLAZIOPSIS. Indusium sausage-shaped, 

 bursting down irregularly. Veins anastomosing. 



GENUS 14. DENNSTAEDTIA- Indueiiun cup-shaped, 

 open at the top. 



