250 
Leioscyphus patagonicus, Pearson, sp. nov. Dioicous. Small 
dark olive brown in colour, caespitose, flagelliferous. Stem 
slightly ramose, branches postical, innovant terminal branches 
postico-lateral ; radiculose, rhizoids few, delicate, hyaline, ascend- 
ing to apex of stem, arising from stem below the underleaves, 
cross-section of stem round, cortical cells smaller than the inner, 
50 to 60, inner 15 cells in diameter. Leaves obliquely inserted, 
patent (50°) to erecto-patent (30°), secund, subopposite, imbricate 
obovate-spathulate, entire, apiculate or bi-apiculate; antical 
(lower) margin decurrent or sometimes longly decurrent; postical 
(upper) margin covering stem or extending a little beyond; 
cuticle polished; cells small, roundish, walls thickened, trigones 
absent. Underleaves free from leaves, large, patulous, concave, 
oval, bidentate to 1/5th, with a small tooth on one or both sides, 
segments acuminate, sinus broad, rounded. 
Androecia on short lateral catkins, 4 pairs of perigonial bracts, 
bracts oval, bracteoles oval, bidentate, segments acute. 
Dimensions. Stems 1 to 2 cm. long; with leaves 0-7 mm. 
wide; diameter 0-1 mm. to 0-25 mm.; leaves 1-1 mm. xX 0:7 
mm.,0-1mm. x 0-7mm.,0-9 mm. x 0-7mm.; cells 0-02 mm. ; 
underleaves 0-55 mm. x 0:4 mm., segments 0-1 mm., 0-55 mm. X 
0-3 mm., segments 0-125 mm., 0-5 mm. x. 0-3 mm., segments 
0-15 mm. perigonial pein _ 6 mm. <X 0-4 mm.; perigonial 
bracteoles 0-5 mm. x 0-3 
Patagonia, Molyneux re Ist June, 1896, P. Dusén. 
( 3 © See 
Description of Text figures. Fig. 1. Portion of stem, postical view 
(x 12). 2. Cross a of stem (x 25). 3-6. Leaves (x 12). 7. Leaf 
& underleaf (x 12).. 8. Margin of leaves (x 25). 9. Portion of leaf 
(x 130). 10, 11. Underleaves (x 12). 12, 13, 14. Ditto (x 25). 15, 16. 
erigonial bracts (x 12). 17, 18. Perigonial bracteoles (x 12). 
