354 THE MICROSCOPIST. 



Tribe 11. Peranemece. Indusium inferior, ultimately 

 lobed or ciliated. 



Gen. 1. Peranema. Sori pedunculate. Indusium cup- 

 shaped, splitting into 2-4 lobes. Sporanges on punctiform 

 receptacle. Veins pinnate. 



Gen. 2. Diacalpe. Sori regular. Indusium sessile, 

 spherical, at first closed. Sori on a punctiform receptacle, 

 then bursting irregularty at the summit. 



Gen. 3. Woodsia. Sporanges pedicellate, inserted at 

 bottom of indusium which is cup-shaped and hairy at 

 margin. Veins pinnate. 



Gen. 4. Hypoderris. Sporanges on almost obsolete axis- 

 Indusium cup-shaped, fringed at margin. Veins anasto- 

 mosing. 



Family II. CYATH^EEJS. Numerous sporanges, united 

 in sori on a salient axis, with a somewhat oblique annulus. 



A. Sori without indusia. 



Gen. 1. Alsophila. Sori globose, regularly arranged. 

 Sporanges on globose axis and imbricated. 



Gen. "2. Tricfiopteris. Sori globose, regularly arranged, 

 laterally confluent. Sporanges on globose axis, areolate 

 and crinite with long hairs. 



Gen. 3. Metaxya. Sori globose, each fertile vein bear- 

 ing several, irregularly scattered. Sporangia on globose 

 axis, beset with long articulated hairs. 



B. Sori indusiate. 



Gen. 4. Hemitelia. Sori globose, each solitary on a 

 pinnule. Indusium an ovate, concave, torn scale, at lower 

 side of the base. 



Gen. 5. Cnemidaria. Sori globose, regularly arranged. 

 Indusium forming an involucre, at length irregularly torn 

 or partite. 



Gen. 6. Cyathea. Sori hemispherical, regular. Indu- 

 sium first closed, then bursting and cup-shaped. 



