1968] 



LEAFY HEPATICAE OF LATIN AMERICA PART III 



317 



4. Cephalozia media Lindberg, Meddl. Soc. Fauna Fl. Fennica 6: 242. 1881. 5 



Plants small, green to whitish, prostrate in mats or scattered among other bryo- 

 phytes; stems 1-2 cm long, with leaves 1-1.3 mm broad, occasionally branched, 

 the branches lateral, of the Frullania type, or more frequently, ventral-intercalary, 

 leafy, some of them short and bearing female inflorescences. Rhizoids from the 

 ventral side of the stem. Line of leaf insertion oblique, nearly longitudinal. Leaves 

 distant to approximate, plane, spreading-ascendant, decurrent, rotund-ovate, 0.27 X 

 0.2 mm, bilobed to one-third the length, the segments connivent, triangular from a 

 2- or 3-celled base, acute with a 1 -celled tip; cells of the base of the segment 25-32 x 

 25-30 /i, the walls uniformly thin, without trigones, the cuticle smooth. Underleaves 

 absent. Plants dioicous. Male inflorescence terminal becoming intercalary on a 

 stem or branch, the bracts resembling the leaves, closely imbricate, erect, concave. 

 Female inflorescence on a short ventral branch, the bracts and bracteoles in 3 series, 

 larger than the leaves, bifid to one-third their length, the margins entire or nearly so. 

 Perianth long cylindrical below, with 3 rounded keels above, the mouth narrowed, 

 truncate, crenulate-denticulate, the teeth 1 or 2 cells long. Gemmae and sporophyte 

 not seen. 



PI. 78. Fig. 4, a-b. 

 Habitat: On soil banks in mountainous areas. [In the West Indies.] 



CUBA: Oriente: Sierra Macstra, 1400 m, Ekman 7115 (S-PA, UPS). 



5. Cephalozia hieuspidata (Linnaeus) Dumortier, Recueil Obs. Jungerm. 18. 

 1835. 



Jungcrmannia bicuspidata Linnaeus, Sp. PI. 1132. 17S3. 

 Cephalozia colombica S. Arnell, in Hb. 



Plants in light green to whitish or occasionally reddish to brownish mats or 

 scattered among other bryophytes; stems prostrate, 1-2 cm long, with leaves to 

 1 mm broad, irregularly branched, the branches lateral, of the Frullania type, more 

 frequently ventral-intercalary, leafy, flagelliform, or short with a male or female 

 inflorescence. Rhizoids frequent, from the ventral side of the stem. Line of leaf 

 insertion oblique. Leaves distant to imbricate, usually plane, ovate in outline, bifid 

 to one-half the length, the segments triangular from a 4- to 8-celled base, ending 

 in a tip two cells long; cells mostly longer than broad, those of the segment 33- 

 39 X 26 fx, uniformly thin-walled, without trigones, the cuticle essentially smooth. 

 Underleaves absent. Plants dioicous and monoicous. Male inflorescence terminal 

 becoming intercalary on a stem, the bracts much like the leaves, ascending, imbricate, 

 concave. Female inflorescence on a short ventral branch, the bracts and bracteoles 

 larger than the leaves, bifid, the segments lanceolate, the margin with occasional 

 teeth or projecting cells. Perianth long, cylindrical below, with 3 rounded keels 

 above, the mouth narrowed, truncate, crenulate and setulose. Gemmae not seen 

 on Latin American plants. 



PI. 78. Fig. 5, a-e. 



° For more complete synonymy see a manual of Hepaticae of Europe or North America. 



Fig. 4. C. media. 4 a. Stem, ventral view, X 50. 4 b. Cells of the upper part of a leaf, 

 X 200. Drawn from material from Cuba, Ekman 7115. 



Fig. S. C. bicuspidata. 5 a. Stem, dorsal view, X 50. 5 b. Cells of one segment of a leaf, 

 X 200. 5 c. Outline of upper part of a female bract, inner series. 5 d. Tip of a female bract, 

 inner series, X 200. 5 e. Portion of a perianth mouth, X 200. Drawn from plants from Mexico, 

 Sharp 986. 



