22 OOPELAND. 



GLEICHENIA Smith. 



Rhizome creeping) frond civet or Bubscandent, with a terminal bud, 

 and one or few pairs of pinnae below it, the succeeding few divisions 



usually dichotonious. X early 80 recognized species, chiefly tropical 



Subgenus I. Eugleichenia. Segments very small and round. 



Largest scales hardly 1 BUB long, very lacerate 1. G. circinnula 



Pubescence including palea 1.5 to 2 nun long 2. Q. riilcnnirn 



Subgenus II. Dicka.noptkkis. Segments larger, oblong to linear. 

 Fronds pinnatifld or pinnate above the upmost fork. 

 X<> special leaflets borne at the forks. 



Segments erenate ;{. <;. amboinenti* 



Segments serrulate near apex only 4. <!. hirhi 



Segments entire. 



Segments distinct and separate f>. O.hispida 



Segments contingent or confluent. 

 Segments coriaceous. 



Segments not horizontal. 



Segments obtuse (5. G.vesiita 



Segments acute 7. (}. loheri 



Segments horizontal K. 0. laevigata 



Segments not coriaceous. 



Segments descending along several internodes. 



Segments horizontal S. G. laevigata 



Segments not horizontal <». G. oceanha 



Segments on only 1 or 2 internodes |o. G.hallieri 



Each fork bearing a pair of special leaflets. 



Segments rigidly coriaceous, bullate ] 1. (!. vrassifolia 



Segments not rigid, usually plane ]■>. G. linearis 



Fronds bipinnatifld above any fork. 



Segments not at nearly a right angle 13, (;, lacrissima 



Segments standing at almost right angles. 



Segments clothed beneath with dense pubescence. 14. (!. bulla in 



Segments not densely pubescent. 



Pinnules stalked, lower segments reduced 15. (!. norriaii 



Lower segments not reduced ]0. <!. 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 \\ pairs of pinna; below 

 (hi' lower fork, the pinna 1 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 rachis, 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 Xew Zealand; on mountain tops. 

 The var. borneensis Baker of Mount Kinabalu is described as having more 

 naked axes, longer pinna\ and more bullate segments. 



