62 10 



often ciliated by simple or branched hairs or pubescent throiighonl. Lamina 

 pinnatifid-pinnate-bipinnatifid, rarely bipinnale. 

 3. Veins free, the basal ones run out to the margin above sinus, rarely furcate. 

 Lamina bipinnatifid or bipinnate, often much reduced toward the base, 

 the lower pinnæ being auriculiform or reduced to mere warts along the 

 stipe. Aërophores frequent. Hairs nearly always simple. 

 4. No keel below the sinus. Sessile glands common. 

 5. Without aërophores at the base of the secondary veins (costulæ) beneath. 

 Lamina nearly always reduced downwards. Veins not very close. In- 

 dusiuni often present but generally small. 



Subgenus 4. Lastrea (Species 54—170). 

 5. Large aërophores at the base of the pinnæ beneath and smaller ones 

 at the base of the secondary veins. Veins very numerous and close, 

 simple. Indusium not seen. 



Subgenus 5. Glaphyropteris (Species 171-176). 

 4. A carinate fold (keel) below the sinus extending toward costa, parallel to 

 the secondary veins. Sessile glands none. 



Subgenus 6. Steiropteris (Species 177 — 180). 

 3. Veins free or anastomosing, nearly always simple; the lower basal ones 

 either run to the sinus, more or less connivent, or they are truly united 

 in the leaf-tissue and send a common-branch to the sinus; in the two last 

 subgenera often several pairs of veins are goniopteroid or all meniscioid. 

 Lamina rarely reduced below. 

 4. Sori round or linear, not confluent. At least the uppermost veins not 

 meniscioid. 

 5. Hairs simple, at least not branched with 2— 6 branches on a short stalk, 

 the scales not furnished with branched hairs. 

 6. Sori round, as a rule with reniform, persistent, setose indusia. S[)o- 

 rangia glabrous. 

 7. Lower basal veins run to the sinus, below which is a cartilagineous 

 membrane, that in dried specimens becomes folded and forms a 

 keel running from the sinus toward the costa. All veins free. 

 Aërophores at the base of the pinna frequent; glands none. 



Subgenus 6. Steiropteris (Species 177—189). 

 7. Lower 1—4 pairs of veins run to sinus or to a membrane, which 

 scarcely forms a keel but is often protruded beyond the sinus as 

 an apophysis, or the basal pair of veins are united in the leaf- 

 tissue and send an excurrent veinlet to the sinus. Aërophore 

 none; under-surface often glandular. 



Subgenus 7. Cyclosorus (Species 190 — 202). 

 (5. Sori oblong or linear, exindusiate; sporangia setose. 



Subgenus 8. Leptogramma (Species 203—205). 



