66 TASMANIAN BRYOPIIYTA, 



clothed with straight bristles. Gemma© on the ventral sur- 

 face of the midrib, discoid, large, many-celled, smooth. 



Marginal hairs always single 2 



Marginal hairs mostly in pairs 3 



2. Frond nearly flat, simple furcata 



Wings split into involute lobes saccata 



3. Midrib hairless atrichuneurd 



Midrib with hairs 4 



4. Nerve sheath 2-celled on both sides ... nltida 

 Nerve sheath 2-celled dorsal ly, 4-celled 



ventrally conjugata 



Metzgeria furcata (L.), Dum. — Variable in size, mostly 

 1-3 cm. long, repeatedly forked, from under 1 to nearly 

 2 mm. diameter, flat, procumbent. Midrib prominent on 

 the ventral surface and 4 cells broad, flat and 2-celled 

 dorsally. Cells of the wings hexagonal, about 32 ^. dia- 

 meter. Under surface more or less clothed with simple, 

 straight hairsi, usually numerous on the midrib, often ab- 

 sent from the wings, except a few just within the margin. 

 Qalyptra broadly clavate, covered with stiff hairs. Spores 

 light brown, granular, about 25 /i., diameter. 



Very common. Mostly on bark. Cosmopolitan. 



Metzgeria saccata, Mitt. — Seldom exceeding 1 cm. in 

 length and 1 mm. in breadth, wings regularly segmented 

 into reflexed saccate lobes, each about 2 mm. long; midrib 

 flat and 2 cells wide on the dorsal surface, prominent, and 

 4-celled on the ventral, a few bold hairs on the margin 

 between the lobes, none on the midrib, cells of the wing 

 32 )"•? Calyptra pyriform, 2.5 mm., coarsely strigose. 



Mt. Wellington, Mt. Hartz, Adamson Peak, Freycinet 

 Peninsula, etc. New Zealand. 



Metzgeria nitida, Mitt. — Slender, ascending, often 3 

 cm. long, 1.5 mm. wide, margins recurved, midrib nearly 

 liat, and 2-celled on both sides, hairs bold, few or copious 

 on midrib and margin, those of the latter mostly in pairs; 

 cells 45 fi. 



Mt. Wellington, Hussell Falls, West Coast, etc. New 

 Zealand. S. America. 



Metzgeria atrlclioneura. Spruce. — Small and repeatedly 

 branched, margin revolute, midrib flat and 2-celled dor- 

 sally, prominent, 2-3-celled ventrally; hairs in pairs, short, 

 and confined to the margin ; cells 45 n. 



Tasraan Peninsula. New Zealand. 



