COMPENDIUM. XXXV 



circular synangia. Fronds small, lernate or qui- 

 nate. 



CLi^SS II. TDBERlTHALiLiOSAE. Prothallium tuberous, 

 white. 



FAMILY X. OPHiOGLOSSACEAE. Sporangia without a ring, sessile, 

 placed on much contracted, spicate or paniculate fertile segments 

 opposite to and springing from the base, the centre or the 

 margin of the normal, frondose, barren segment. Indusium wanting. 



GENUS 93. OPHIOGLOSSUM. Fertile segment spicate, 

 with the sporangia in 2 opposite, lateral rows. 

 Barren segment simple; veins anastomosing. 



GENUS 94. HELMINTOSTACHYS. Fertile segment 

 spicate, with the sporangia in numerous crested 

 clusters spreading in all directions. Barren seg- 

 ment divided; veins free. 



GENUS 95. BOTRYCHIUM. Fertile segment panicu- 

 late, with the sporangia placed in 2 rows on the 

 inner face of the branches. Barren segment di- 

 vided; veins free. 



Abbreviated natural arrangement 



of the 



FAMILIES, TRIBES AND GENERA 



as construed in this work. 



I. CYATHEACEAE. (Diels, in Engl. & Prantl, Nat. Pfl. Fam., I*, 113). 

 I. Cyatheae. (Diels, I.e., 123). 



1 Gyathea, 



2 Hemitelia, 



3 Alsophila. 



