1968] 



LEAFY HEPATICAE OF LATIN AMERICA — PART III 



379 



1. Alobiella campanensis Stephani, Spec. Hep. 6: 443. 1924; Icon. Hep. Alobi- 



ella no. 4. 



Leafy stems from a caudex, complanate, small, whitish-green becoming light 

 brown, ascendant in tufts. Stems 1-2 cm long, with leaves 1.5-2 mm wide, occa- 

 sionally branched, the branches ventral-intercalary in the axils of underleaves, leafy 

 or more rarely flagelliform and bearing leafy branches; stems flattened dorsally, 

 with 2 rows of very large cortical cells between the rows of leaves, on the ventral 

 side convex and of many smaller cortical cells. Rhizoids long, slender, scattered on 

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

 subimbricate, plane, widely spreading, ovate, acute to bidenticulate, 0.7-0.9 mm 

 long, 0.3-0.4 mm wide at the middle, the base straight, the margins entire, not 

 bordered by narrow cells; cells of the upper part of the leaf rectangular, 50-65 X 

 20-25 fi, the walls slightly thickened, without trigones, the cuticle essentially smooth. 

 Underleaves appressed, longer than broad, bifid to one-half, the segments long, 

 narrow-triangular, unequal. Male and female inflorescence and perianth not seen. 

 Regeneration from leaf cells. 10 



PI. 103. Fig. 1, a-h. 



Habitat: Unknown. 



PERU: Monte Campana, Spruce (type G-606) ; Monte Guayrapurina, Spruce, Hep. Sprue, 

 as A. husnoti (BM, MANCH, NY). 



2. Alobiella husnoti (Gottsche) Schiffner in Engler & Prantl, Nat. Pflanzenf. 



I s : 98. 1895. 



Jungermannia husnoti Gottsche in Husnot, Hep. Antill. Exsicc. no. 242. 1874. 

 Cephalozia Subg. IV Alobiella, husnoti (Gottsche) Spruce, On Cephalozia 30. 1882. 

 Jungermannia lancijolia Spruce ms. 1885. 



Leafy stems arising from a leafless caudex, complanate, of small to medium size, 

 whitish-green becoming brownish, in dense mats or among other bryophytes. Stems 

 1.0-3 cm or more long, with leaves to 3 mm broad, prostrate to ascending, occasion- 

 ally branched; branches ventral-intercalary in the axils of the underleaves, leafy 

 or flagelliform, the latter (as a caudex) often bearing many leafy branches; stems 

 flattened dorsally, cells of the 2 dorsal cortical rows between the leaves very large, 

 70 X 60 fi, the cells under the leaf insertion also large, the ventral side of the stem 

 convex, the cortical cells numerous, narrow; in transverse section the layer of 

 cortical cells in about 12-16 rows, the 5 or 6 cells from the dorsal merophytes very 

 large, those from the ventral merophyte small, the medulla of many cells scarcely 

 larger than the ventral cortical cells. Rhizoids long, slender, from the ventral 

 cortical cells of the stem. Line of leaf insertion nearly longitudinal, the leaves 

 succubous. Leaves plane, widely spreading, ovate to 1.3 mm long, often shorter, to 

 0.6 mm broad at the middle, the apex shortly bidentate, bidenticulate or more rarely 

 acute, the margins entire or rarely crenulate from projecting cell ends, the marginal 

 cells long, narrow, forming an inconspicuous border; cells of the upper part of the 

 leaf rectangular, 52-70 /a or longer, 26-35 /j. wide, the walls uniformly thickened, 

 without trigones, the cuticle essentially smooth. Underleaves appressed to the stem, 

 long, rectangular in outline, bifid to one-half, the segments narrow-triangular, parallel 

 or spreading above, the cells as in the leaf. Plants dioicous. Male inflorescence 



10 On a stem of the type material, many of the leaf-cells, particularly those of the lower part 

 of the leaf, had become enlarged and bulged at one end. Growth and cell division had continued 

 in some to form long branched filaments. 



