AXEURA. 451 



Found on the Continent, in North and South America and 

 Cuba. 



Obs. — A distinct species, the growth on rotting trees, the 

 palmatifid fronds, bi-convex stem and branches, dioicous in- 

 rlorescence cliaracterising it. 



Description of Plate CXCIX. — Fig. 1. Plants natural 

 size. 2. Plant x 24 (202 G-. & \l.). 3. Portion of frond x 24 

 (Cromaglovvn, Stewart & Holt). 4, 5. Cross-sections of frond x 

 r)4 (ditto). 6. Portion of calyx x 64 (ditto). 7. Calyptra x 

 24 (ditto). 8. Valve x 24 (ditto). 9. Androecia x 24 (ditto). 

 10. Cross-section of same x 85. (Killarney, Dr. C.) 11. An- 

 iheridium x 64 (Cromaglown, Stewart & Holt). 



2. Aneura multifida (Z.), Dnin. 



Jungermania multifida, Linn. Sp. pi. 1G02 (1753). 



Riccardia multifida, Gr. & Benn. Nat. Arr. Brit. pi. 1, p. (583 (1821). 



Aneura multifida, Dum. Comm. Bot. p. 115 (1822). 



Monoicous, ^ usually near the $, in small, loose or crowded 

 tufts or among mosses, small, green to yellowish-green in colour, 

 turning brown when old. Fronds prostrate or somewliat erect, 

 irregularly pinnate or bipinnate, cross-section lenticular, at the 

 middle 5 to 8 cells thick, the inner ones larger, gradually 

 becoming thinner towards the margin, where it is 1 cell thick, 

 about 20 cells round; apices obtuse or emarginate; texture 

 fleshy, succulent; epidermis finely punctate. Female inflores- 

 cence lateral, usually on the chief stem, sessile ; bracts short, 

 laciniate, fimbriate. Calyptra oblong-clavate, fleshy, smooth or 

 very slightly tuberculate. Pistillidia 10-14. Capsule striate, 

 subcylindricai, dark brown. Spores reddish-brown, larger than 

 the thickest part of the elaters, roundisli-tetrahedral, indistinctly 

 granulate. Elaters reddish-brown, attenuate, often at one end 

 only, frequently attached to the apices of the valves. Androecia 

 generally on main stem, lateral, linear, simple or binate, in 

 which are imbedded 4-6 roundish-oval antheridia. Sometimes 

 gemmiparous, gemmae at apices of branches, roundish-oval, 

 angular. 



