i!)<;t) I 



LEAFY HEPATICAE OF LATIN AMERICA — PART II 



221 



broad, irregularly branched and bearing long blackish stolons; lateral branches 

 long, leafy, the ventral branches intercalary, long leafy and branched, or long 

 flagelliform, or long stolon-like, or lighter in color, enlarged and turgid, with 

 small leaves and long internodes, and eventually bearing a female inflorescence, or 

 short sexual; stems in transverse section of a single layer of 12 larger cortical 

 cells with thicker walls, surrounding the medulla. Line of leaf insertion transverse. 

 Leaves and underleaves alike, distant to approximate, symmetric squarrose- 

 ascendent, incurved above, to 0.36 mm long, 0.27 mm wide at the middle, cuneate, 

 the margins of the lamina entire, quadrifid to one-half their length; segments 

 triangular from a mostly 4-celled base, six to eight cells long, the tip a row of 

 two cells; leaf-cells at the base of the segment 18x18 the walls thickened, 

 the trigones obscure, the cuticle faintly verruculose. Plants dioicous. Male 

 inflorescence on a short ventral sexual branch or terminal on a longer branch, 

 the bracts and bracteoles in three to six series, the bracts mostly trifid, concave, 

 with a toothed margin, the bracteoles plane, bifid; antheridia one or two in the 

 axils of the bracts. Female inflorescence on a short sexual branch, a longer leafy 

 or flagelliform ventral branch, or a lateral branch of the stem with or without 

 an enlarged turgid axis below, or terminal on an enlarged turgid ventral branch; 

 bracts and bracteoles in three to four series, faintly keeled, the outer series 

 quadrifid above, the innermost series broadly ovate with scattered marginal 

 teeth and lobes, the cells thin-walled. Perianth to 3 mm long cylindrical below, 

 contracted and 3-keeled above, the mouth crenulate. Mature sporophyte not 

 seen. PI. 47. Fig. 2, a-h. 



Habitat: Abundant on decayed logs, soggy ground, and over Sphagnum and 

 other bryophytes, in bogs and wet thickets. 



PATAGONIA— TIERRA DEL FUEGO: Guaitecaa I., Dusen (C, G-5427, 5428, G, K, 

 NY, S-PA), Dusen 386 (G-177, S-PA), Guaitecas I., Melinca, Halle [1907-08] (S-PA), 

 Skottsberg & Halle [1907-08], the type of L. diversijolia (G) ; Patagonia, Dusen 386 p.p. 

 (G-5426); Saddle I., Hariot 166, (type PC, isotype G) ; Hoste I., Hardy Peninsula, Bahia 

 Orange, [voyage of the "Yelcho"], Chelminski 15 (Hb Fulford). 



TRISTAN DA CUNHA: Christophersen & Meyland 1080, 1088, 1121 (1938) (S-PA). 



There are additional reports of the species from Patagonia (Schiffner, 1889; Stephani, 

 1900a, 1900b, 1901a, 1911), Tierra del Fuego (Bescherelle & Massalongo, 1889; Gola, 1923 

 (= Lepidozia) ; Stephani, 1901a), and the Falkland Islands (Skotteberg, 1913; Stephani, 1905a). 



3. Micrisophylla mollis (Stephani) Fulford, Brittonia 14: 131. /. 103-114. 

 1962. 



Lepidozia mollis Stephani, Spec. Hep. 3 : 601. 1909; Icon. Hep., Lepidozia No. 136/137. 



Plate 47 



Fig. 1. Micrisophylla setiformis. la. Stem, dorsal view, X 25. lb. Stem, ventral view, 

 X 40. 1 c. Leaves, X 80. 1 d. Segment of a leaf, X 350. 1 e. Underleaf, X 80. 1 f. Transverse 

 section of the stem, X 175. 



Fig. 2. M. saddlensis. 2 a. Growth habit of a plant showing the positions of the female 

 inflorescences, +; F, branch of the Frullania type; I, ventral axillary intercalary branch; 

 S, stolon; T, enlarged, turgid axis below some of the inflorescences, or as a ventral branch. 

 2b. Stem, dorsal view, X85; F, branch of the Frullania type; Fl, dorsal half-leaf with this 

 branch. 2c. Stem, ventral view, X60; F, branch of the Frullania type; FL, dorsal half-leaf 

 with this branch; M, branch of the Microlepidozia type; ML, ventral half-leaf with this 

 branch. 2d. Stem with, F, branch of the Frullania type; FL, dorsal half-leaf with this branch; 

 T, I, a turgid, ventral intercalary branch with a basal collar and at the tip, a female 

 inflorescence. 2 e. Leaf segment, X 350 2 f . Transverse section of a stem, X 350. 2 g. 

 Diagrammatic longitudinal section through a female inflorescence and a young sporophyte; 

 B, female bracts (four series; C, capsule; D, seta; E, foot; P, perianth; U, \infertilized 

 archegonium. 2 h. Portion of the mouth of the perianth, X 350. 



Drawings after Fulford, 1962. 



