1962] 



LEAFY HEPATICAE OP LATIN AMERICA — PART I 



59 



Plants small, erect, tending to be radially symmetric, dull reddish-brown, 

 in tufts or among other bryophytes; stems slender, to 3 cm long, irregularly 

 branched, the branches infrequent, long, lateral, the half-leaf with two major 

 divisions, at the dorsal base on the branch; stem in transverse section with the 

 cortical cells scarcely smaller than those of the medulla. Rhizoids in fascicles, 

 from the lamina of the underleaves. Line of leaf insertion transverse. Leaves 

 distant, spreading to ascendent, subquadrate in outline, 0.8-0.96 mm long, 0.8 

 mm wide (including the basal teeth), quadrifid to three-fifths of their length; 

 segments long, lanceolate from a base seven to ten cells wide, narrowing to a 

 uniseriate tip five to seven cells long, entire, or with an occasional spine or 

 cilium four to six cells long near the base; lamina with one or more long, 

 lanceolate, spreading teeth on one or both sides near the base ; cells of the seg- 

 ment tips mostly 36 X 20-24 fi, the cells of the lamina 27-36 X 18 the trigones 

 inconspicuous, the cuticle weakly striolate. Underleaves similar, scarcely smaller. 

 Plants dioieous. Male inflorescence terminal becoming intercalary on the stem 

 or a branch, the bracts and bracteoles in three to five or more scries, the bracts 

 concave, with shorter segments bearing more spines than the leaves, the lamina 

 with frequent superficial spines on the ventral surface ; bracteoles plane ; anther- 

 idia one or two, in the axils of the bracts. Female inflorescence terminal on 

 the stem or branch, occasionally with one or two innovations, the bracts and 

 bracteoles similar, those of the inner series larger than the leaves, the margins 

 and segments with many opposite pairs of spines or cilia, the lamina with ciliate 

 and toothed margins, the long basal teeth with opposite spines. Perianth and 

 sporophyte not seen. Fig. 4, a-g. 



Habitat: On humus. 



PATAGONIA— TIEEEA DEL FUEGO: Puerto Bueno, Busen 46 (type G) ; Magellan 

 Rtraits, Warnstorf 11 p.p.; Fuegia, Halle (G). 



The species is readily distinct from the other members of this genus because 

 of the very long segments with few or no marginal teeth. It is perhaps most 

 like T. quadrifidum Mitten of New Zealand but the plants of the latter species 

 have less brown pigmentation, the quadrifid leaves have no marginal spines or 

 cilia on the segments or the lamina, and the segments are not so long, the 

 uniseriate tip is of only two or four cells. The male bracteoles of T. quadrifidum 

 have entire margins and no superficial cilia, the female bracts and bracteoles of 

 the two species are alike. There are no reports of T. quadrifidum in South 

 America. 



6. Temnoma pungens (Herzog) Fulford, comb. nov. 



Blepharostoma pungens Herzog, Eevue Bryol. Lichenol. 29: 189. /. 2, a-e. I960. 



Plants small, erect, radially symmetric, reddish-brown, scattered among other 

 bryophytes ; stems slender, to 3 cm long, simple or very rarely branched ; stems 

 in transverse section with the cortical layer scarcely different from the medulla. 



Fig. 3. Temnoma quadripartitum. 3 a. Female inflorescence, X 133. 3 b. Stem, lateral 

 view, X 133. 3 e. A segment of the leaf, X 300. 3 d. Underleaf on a stem, X 133. 3 e. 

 Branched tip of a rhizoid. 3 f. Male inflorescence, X 133; B, bract. 3 g. Portion of the 

 mouth of the perianth, X 350. 



Fig. 4. I. subintegrum. 4 a. Stem, lateral view, X 80. 4 b. Leaf, X 80. 4 c. Seg- 

 ment of a leaf, X 150. 4d. Underleaf, X 80; E, area of rhizoids. 4 e. Portion of a trans- 

 verse section of a stem, X 350. 4 f. Female bract of an intermediate series, X 80. 4 g. 

 One segment of a female bract of the innermost series, X 133. 



