POnELLA. 85 



oval on cross-sGction, about 50 cells in circumference, which are 

 small witli firm dark walls, l^tid and 3rd outer layers with dark 

 walls, inner cells lari^er with hyaline walls, '1^) x \(} cells in diam. ; 

 radiculose, rootlets few, proceeding- from the lower portion of the 

 stem. Leaves incubous, closely imbricate, hilarious, distichous, 

 alternate, horizontal, unequally bilobed, antical lobe much the 

 largest, obliquely ovate or broadly ovate, slightly convex, near the 

 base more or less concave, margin curvate and undulate, entire, 

 but usually with a solitary tooth on the upper margin near the 

 middle, a})ex rotundate-obtuse, slightly decurved ; postical lobe or 

 lobule erect or erecto-patent, appressed to antical lobe, slightly 

 decurrent, subobliquely ovate or oval, apex obtuse or subacute, 

 margin recurved, entire, sometimes furnished with one or two 

 small teeth at the base ; texture opaque, epidermis without gloss, 

 cells smallish to medium in size, roundish, walls thin, trigones 

 Very small but disHnct. Stipules approximate, appressed to the 

 stem, decurrent, semi-rotund or oval, margin reflexed, entire. 



Female flowers produced on very short lateral branchlets at 

 right angles to the branches. Bracts somewhat similar to the 

 leaves but smaller, antical and postical lobes dentate, but the latter 

 larger in proportion ; bracteole semi-obovate, entire or with few 

 small teeth near the base on both sides. Perianth subovate, com- 

 pressed, margin involute, composed of a single layer of cells, mouth 

 truncate, inciso-serrate. Pistillidia oblong, large, 8-10. Calyptra 

 spherical, carnose, somewhat firm, near the base several small cells 

 thick, upper portion composed only of a single layer. Pedicel 

 very short, thick, 15 large cells in diameter. Capsule only just 

 protruding from the perianth, pale yellowish-brown, dividing not 

 quite to the base into 4 valves, which are composed of one layer of 

 cells. Spores smooth, very large, brown. Elaters with about 10 

 to ]'2 turns of the spii-al, bi-trispiral, much narrower than the 

 spores, and lighter brown. Androecia on very short oval catkin- 

 like lateral branches ; [)erigonial bracts 4, 5 pairs, closely imbricate, 

 ver\' concave, semi-ovate, bilobed, lobes sometimes subequal, antical 

 usually largest, margin slightly involute, entire; perigonial brac- 

 teole ovate, entire or with few minute teeth near the base on both 



