520 JUNGEBMANNIACEAE. 



2. Frullania rio j aneirensis (Eaddi) Spruce, Trans. Bot. Soe. Eclinb. 15: 23. 



1884. 



Frullanoides riojaneirensis Eaddi, Mem. Soe. Ital. Modena 19: 37. 1823. 



Closely related to F. arietina but distinguished by its autoeeious inflores- 

 cence. Androecia occupying short branches in the vicinity of the female in- 

 florescence, not proliferating, the bracts mostly in two or three pairs; female 

 branch short, the leaves and bracts forming a gradual series. 



On twigs. New Providence : Florida ; widely distributed in tropical America. 

 Rio JANEIRO FRULLANIA. 



3. Frullania gibbosa Nees in G. L. & N. Syn. Hep. 411. 1845. 



Greenish yellow to dark brown, growing in closely appressed tufts or mats. 

 Leaves densely imbricated, the dorsal lobe convex when dry, concave and squar- 

 rose when moist, broadly orbicular, about 0.9 mm. long; lobule sometimes in- 

 flated throughout but normally in the upper part only ; leaf-cells with conspicu- 

 ous trigones, averaging about 33 fj, ; underleaves densely crowded, orbicular to 

 renif orm, shortly and sharply bidentate at the apex with a lunulate sinus, auricu- 

 late at the base; inflorescence monoecious (autoeeious or paroecious) ; female 

 branch very short, the bracts in two or three pairs, the innermost with ovate, 

 rounded or obtuse, entire lobes and subequal, strongly convolute, obtuse to 

 acute lobules; bracteole highly connate, bifid with sharp divisions; perianth ob- 

 long, with two distinct lateral keels and a broad two-angled ventral keel. 



On bark, Abaco and New Providence : Alabama ; widely distributed in the 

 American tropics. The Bahamian specimens are not typical and may represent an 

 undescribed species. GIBBOUS FKULLANIA. 



4. Frullania squarrosa (Eeinw. Bl. & Nees) Dumort. Eecueil d'Obs. 13. 1835. 



Jungermannia squarrosa Eeinw. Bl. & Nees>, Nova Acta 12: 215. 1824. 



Dark green or pigmented with brown, scattered or growing in depressed 

 mats. Leaves imbricated, the lobe rolled around the stem when dry, strongly 

 squarrose when moist, ovate, rounded at the apex, and entire ; lobule about as 

 broad as long; underleaves bifid, usually with entire margins; inflorescence 

 dioecious ; female inflorescence borne on a short and simple branch, bracts in 

 about three pairs; perianth oblong, without supplementary keels, surface more 

 or less roughened by scattered tubercles or scales, especially along the keels. 



On bark, Great Bahama, Berry Islands, New Providence, Eleuthera and An- 

 guilla Isles : Connecticut to Ohio and south to Florida and Louisiana ; Bermuda ; 

 widely distributed in tropical regions throughout the world. SPREADING FRULLANIA. 



5. Frullania obcordata Lehm. & Lindenb. in G. L. & N. Syn. Hep. 447. 1845. 



Yellowish green to reddish brown, growing scattered or in closely ap- 

 pressed mats. Leaves closely imbricated, the dorsal lobe convex, ovate, about 

 0.7 mm. long ; lobule short-elavate, inflated throughout, spreading at a wide 

 angle ; leaf -cells with more or less distinct trigones, averaging about 18 n ; 

 underleaves subimbricated, orbicular, bifid about one half with obtuse or sub- 

 acute divisions and sinus; inflorescence autoeeious; androecia occupying short 

 branches in the vicinity of the female inflorescence, the bracts in one or two 

 pairs ; female branch long, the bracts in three or four pairs, the innermost with 

 ovate, obtuse or apiculate, entire lobes and smaller subacute lobules ; bracteole 

 free or slightly connate, bifid about one third ; perianth obcuneate, the beak in 

 a slight depression, lateral keels and the single ventral keel distinct. 



On bark, New Providence : Florida to Louisiana ; tropical America. OBCORDATE 

 FRU LLAMA. 



