24 



101. JPSIL.OTUM, 



Sporangia globoso-triangular, 3-locular, 3-lobed, much larger than the 

 sporophylla. 



Stems flattened or angular, mostly copiously dichotomous in the 

 upper half; trachei'de bundles united in a single, irregularly stellate, 

 3 10-radiate group. Leaves minute, rather rudimentary, sessile, remote, 

 triangular, arranged in 2 3 rows; sporophylla as large as the barren 

 leaves, sessile, adnate, deeply and acutely 2-lobate-dentate, arranged all 

 down the branches. Engl. & Prantl, Nat. Ffl.Fam., I 4 , fig. 382, 383 A. 



Chiefly tropical and subtropical. 



* Stem and branches flattened; leaves in 2 roivs. (1) Ps. complanatum. 

 * Stem and branches triquetrous; leaves in 3 rows. (2) Ps. triquetrum. 



(1) Ps. complaiiatiim, 8u>., Syn., 188, 414, tab. IV, fig. 5; 

 Bk., Fern AIL, 30; Schk., Krypt. Gew., I, tab. 165 b; Ps. ZoUingeri, Ces., 

 Fel. di Bor., 36; var. fiaccidum; Ps. flaccidum, Watt. 



Whole plant about 15 60 cm. long, pendulous, laxly branched, the 

 ultimate branchlets flat, 2 4 mm. broad, and the leaves and sporangia 

 arranged distichously. 



Var. flaccidum: Branchlets broader. 



Tropical and subtropical. 



(2) Ps. trlquetriiiii. ?., Syn., 117; Bk., Fern All., 30; Schk., 

 Krypt. Gew., I, tab. 165 b; Bau. & Hk., Gen. Fil., tab. LXXXVH; Hk., 

 Fil. Exot., tab. LXIII; var. capillare; Ps. capittare, Bl. 



Whole plant about 1560 cm. long, erect or nutant, many times di- 

 chotomously forked; branches triquetrous, the ultimate branchlets Ys 1Y* 

 mm. thick, and the leaves and sporangia placed on the angles of the 

 branches. 



Var. capillare: Branchlets fine, indistinctly triquetrous. 



Tropical and extra-tropical. 



