22 
COPELAND. 
GLEICHENIA Smith. 
Rhizome creeping; frond erect or subseandent, with a terminal bird, 
and one or few pairs of pinnae below it, the succeeding few divisions 
usually dichotomous. Nearly 80 recognized species, chiefly tropical. 
Subgenus I. Eugleichenia. Segments very small and round. 
Largest scales hardly 1 mm long, very lacerate 1 . G. circinnata 
Pubescence including pale* 1.5 to 2 mm long 2. G. vulcanica 
Subgenus II. Dicranopteris. Segments larger, oblong to linear. 
Fronds pinnatifid or pinnate above the upmost fork. 
No special lealiets borne at the forks. 
Segments crenate - — 3. G. amboinensis 
Segments serrulate near apex only 4. G. liirta 
Segments entire. 
Segments distinct and separate 5. G. hispida 
Segments contingent or confluent. 
Segments coriaceous. 
Segments not horizontal. 
Segments obtuse (3. G. vestita 
Segments acute 7. G. loheri 
Segments horizontal 8 . G. laevigata 
Segments not coriaceous. 
Segments descending along several internodes. 
Segments horizontal 8. G. laevigata 
Segments not horizontal 9. G. oceanica 
Segments on only 1 or 2 internodes 10. G. hallieri 
Each fork bearing a pair of special leaflets. 
Segments rigidly coriaceous, Initiate - 11. G. crassifolia 
Segments not rigid, usually plane 12. G. linearis 
Fronds bipinnatifid above any fork. 
Segments not at nearly a right angle 13. G. laevissima 
Segments standing at almost right angles. 
Segments clothed beneath with dense pubescence 14. G. bullata 
Segments not densely pubescent. 
Pinnules stalked, lower segments reduced 15. G. norrisii 
Lower segments not reduced... 16. G. japonica 
1. Gleichenia circinnata Swtz. 
Rhizome stout, creeping, woody; well-developed fronds more than 50 
cm high, once or twice forked at the top with 1 to 3 pairs of pinnae below 
the lower fork, the pinnae once or twice forked, and the lowest sometimes 
with a pair of lateral pinnae ; axes brown, clothed with minute, rather 
deciduous, dark brown, deeply lacerate scales; pinnules linear, some- 
times 55 mm long, about 1.5 mm wide except at the base, borne on all 
axes except the main raehis, cut to almost the costa into roundish, strongly 
bullate, entire coriaceous lobes or segments, the lowest pair of which 
are usually much enlarged, costa naked above, lacerate-squamulose be- 
neath ; sori of 2 to 4 sporangia. 
Malacca, Borneo, and Palawan to New Zealand; on mountain tops. 
The var. borneensis Baker of Mount Kinabalu is described as having more » 
naked axes, longer pinnae, and more bullate segments. 
