LEAFY HEPAT1CAE OF LATIN AMERICA — PART I 



75 



walls uniformly thin, cells of the segments and margins smaller, the cuticle 

 minutely striolate-papillose. Underleaves nearly as large as the leaves, oval to 

 orbicular, bifid to one-half of their length, the margins with one to several long, 

 coarse, lateral teeth. Male and female inflorescences and sporophyte not seen. 

 Fig. 9, a-d. 



Habitat : On soil. 



PATAGONIA— TIERRA DEL FUEGO: Valdivia, Krause (SPA); s.l., Skottsberg 

 742, (type G) ; s.l., Skottsberg 736, 737, 741 (G). [The specific localities where Skottsberg 

 collected the material are given by Stephani (1911), but there are no collection numbers 

 with these localities and no data on the packets.] 



10. Isotachis inflata Stephani, Arq. Mus. Rio de Janeiro 13: 113. 1903. 



Isotachis uleana Stephani, Spec. Hep. 3: 663. 1909 



Plants of medium to large size, greenish-brown to dark brown, ascending to 

 erect, in tufts or cushions; stems to 6 cm long, occasionally branched; stems 

 12—15 cells in diameter, the cortical cells in two layers, smaller and with thicker 

 walls than those of the medulla. Rhizoids not seen. Leaves imbricate, widely 

 spreading, canaliculate, broadly ovate-truncate, bifid to one-third of their length ; 

 segments broadly triangular, the apices rounded, the sinus lunulate; leaf mar- 

 gins entire or with an occasional tooth on the ventral side ; cells of the median 

 portion of the lamina averaging 60 X 27 the walls uniformly thin, the row 

 of marginal cells larger, their long axes at right angles to that of the leaf, the 

 walls uniformly thickened, trigones very small or absent, the cuticle smooth. 

 Underleaves smaller than the leaves, appressed, imbricate, ovate-truncate to 

 orbicular, bifid to one-third of their length, the segments obtuse, the margins 

 with one to several conspicuous teeth. Male and female inflorescences and spor- 

 ophyte not seen. Fig. 10, a-e. 



Habitat: On soil. 



BRAZIL: Rio de Janeiro, Glaziou 5129, type of I. uleana (type G, isotype NY), 

 Glaziou 11753 (NY), Glasiou (as 7. tnulticeps) (S-PA, G), Glaziou (as 7. conduplicata) 

 (BM) ; Serra do Itatiaia, Dusen, (type G, isotype FH) ; s.l., Dusen 369 (as I. rruiscula) 

 (G) ; s.l., Ule 432 (G). 



Fig. 7. Isotachis- auberti. 7 a. Stem, ventral view, X 9. 7 b. Leaf, X 18. 7 c. Cell 

 from the median portion of a leaf, X 165. 7 d. TJnderleaf, X 18. 



Fig. 8. 7. lindigiana. 8 a. Stem, ventral view, X 9. 8 b. Leaf, X 18. 8 c. Cell from 

 the lamina of the leaf, X 165. 8 d. Underleaf, X 18. 8 e. Cells from the margin of a leaf, 

 X 165. 



Fig. 9. 7. grossidens. 9 a. Stem, ventral view, X 9. 9 b. Leaf, X 18. 9 c. Cells from 

 the median portion of the leaf, X 165. 9 d. Underleaf, X 18. 



Fig. 10. 7. inflata. 10 a. Stem, ventral view, X 9. 10 b. Leaf, X 18. 10 c. Cell from 

 the median portion of a leaf, X 165. 10 d. Underleaf, X 18. 10 e. Portion of a transverse 

 section of a stem, X 165. 



Fig. 11. 7. fragilis. 11 a. Stem, ventral view, X 9. 11 b. Leaf, X 18- He. Cell from 

 the median portion of a leaf, X 165. 11 d. Underleaf, X 18. 



Fig. 12. 7. splendens. 12 a. Stem, ventral view, X 9. 12 b. Leaf, X 18. 12 c. Cell 

 from the median portion of a leaf, X 165. 12 d. Cells from the margin of a leaf segment, 

 X 165. 12 e. Underleaf, X 18. 12 f. Portion of a transverse section of a stem, X 165. 



Drawn from Hatcher, 1960. 



