1962] 



LEAFY HEPATIC A E OF LATI N AMERICA — PART I 



SI 



1. Pachyglossa tenacifolia (Hooker t. & Taylor) Herzog & Grolle, Revue Bryol. 

 Lichenol. 27: 153. /. 1-10. 1958. 



Jungermania tenacifolia Hooker f. & Taylor in J. I). Hooker, Rot. Antarct. Voy. I 1 : 



152. pi. 64, f. 6. 1845. 

 Mastigobryum tenacifolium (Hooker f. & Taylor) Mitten in J. D. Hooker, Bot. Antarct. 



Voy. 2 a : 147. 1853. 



Herpocladium tenacifolium (Hooker £. & Taylor) Mitten, Jour. Linn. Soc. Bot. 15: 69. 

 1877. 



Bazzania ? tenacifolia (Hooker f. & Taylor) Massalongo, Nuovo Gior. Bot. Ital. 17: 

 243. 1885. 



Pachyglossa tristicha Herzog ex Martin, Trans. Proc. Koy. Soc. N. Zeal. 78: 500. 1950 

 (nomen nudum); Revue Bryol. Lichenol. 21: 256. /. 1, a-d. 1952. 



Plants of medium size, erect, with stolon-like branches from the base, radially 

 symmetric, dark brown, in tufts or among other bryophytes; stems rigid, 3-5 

 cm long, with leaves 1 mm wide, sparingly irregularly branched ; branches in the 

 axils of both leaves and underleaves, long, leafy or flagelliforni with scale-like 

 leaves; stem in transverse section brown, with a cortical band of three layers 

 of cells with very thick walls. Rhizoids in groups from near the bases of the scale- 

 leaves of the flagelliforni branches. Leaves erect-spreading, ligulate, obtuse or 

 scarcely emarginate, mostly 1 mm long, 0.35-0.4 mm wide, the margin entire, 

 pluristratose, of two layers of cells at the middle and above, of more layers be- 

 low : leaf-cells in surface view quadrate, the wall uniformly thickened. Under- 

 leaves similar, scarcely distinguishable. Plants dioicous. Female inflorescence 

 terminal on the stem or a long branch, the bracts and bracteoles in two or three 

 series, similar, like the leaves and underleaves, larger, pluristratose; archejronia 

 ten to fifteen. Perianth (immature) three-keeled, divided into three long lobes 

 above, with undulate to obscurely toothed margins. Sporophyte not seen. Fig. 



1, a-e. 



Habitat : On soil in exposed places. 



The species has been collected on the Auckland Islands and Stewart Island, 

 and has been reported in the literature from South America by Massalongo 

 (1885, coll. Spegazzini) and Stephani (1911, coll. Skottsberg). The latter col- 

 lections belong to the next species which is very similar. I have seen no speci- 

 mens from South America. 



2. Pachyglossa dissitifolia Herzog & Grolle, Revue Bryol. Lichenol, 27: 155. 



/. 2, 3. 1958. 



Pachyglossa dissitifolia Herzog, Revue Bryol. Lichenol. 21: 259. /. 1952. (nomen nudum.) 



Plants of small to medium size, erect, with stolon-like branches from the 

 base, radially symmetric or nearly so, flaccid, in tufts or among other bryo- 

 phytes ; stems slender, to 5 cm long, with leaves to 1 mm wide, occasionally 

 branched; branches axillary from the leaves and underleaves, leafy or flagelli- 

 forni ; stems in transverse section with a unistratose cortical layer of many cells, 

 some smaller than those of the medulla, the walls scarcely thickened. Leaves 

 ligulate or narrowly ovate, obtuse, patent, pluristratose throughout, the margins 

 entire ; leaf -cells in surface view 15-25 X 15 X 35 ft, the walls uniformly thick- 

 ened, the trigones minute, the cuticle verruculose. Underleaves similar, scarcely 

 smaller, occasionally very shortly bifid. Plants dioicous. Male inflorescence 

 terminal, becoming intercalary on the stem or leafy branch, the bracts and 

 bracteoles in few pairs, similar to the leaves and underleaves; antheridia solitary 



