BY L. RODWAY. 67 



Aletzgeria conjiigata, Lindh. — Slender, often 3 cm. 

 long, 1.5-2 mm. wide, margin recurved, midrib flat, 2-celled 

 on the; dorsal surface, produced, and 4-celled on the ven- 

 tral ; wings nude, but margin and midrib bearing many 

 straight hairs, mostly in pairs ; cells 45-60 /z. long ; cuticle 

 smooth. 



East Coast. Cosmopolitan. 



Hymenophytum, Dum. 



Frond from a cylindric base, broadly membranous, de- 

 cumbent or erect, simple to several times forked and fan- 

 shaped above, midrib narrow. Archegonia on very short 

 branches, arising from the ventral surface just below tlie 

 membranous expansion, or at the lower fork; involucre 

 bilobed ; perianth clavate, with a fimbriate mouth ; 

 calyptra membranous. Antheridia on short, special 

 branches on the ventral aspect of the midrib, or reduced 

 to rotund cushions on the surface. 



Frond fan-shaped flaheUatum 



Frond simple or once forked ijlvyUantliusi 



Hymenophytum flaheUatum {Hool-), St. — Fronds from 

 a creeping cylindrnc stolon, erect, a long stalk and a 2-3 

 forked membranous fan-shaped head ; midrib thin. 

 Perianth arising on the ventral surface of primary or 

 secondary forks, about 1 cm. long, surrounded at the base 

 by a short bilobed involucre; lobes reniform to- oblong; 

 margin entire, obscurely toothed or irregularly spinous. 

 Antheridia on discoid cushions on the ventral surface. 



Stephani makes the typical fonii with more than two 

 jjrimary divisions to the fan, stalk not ^± all winged, mid- 

 rib lost below the apex, and the involucre spinous. 



He adopts Taylor's //. leptopociuin as a good species. 

 This is generally less robust, with the primary division 

 simply dichotomous, stipes winged above, midrib per- 

 current, and involucre entire. 



Tasmanian forms, whether small or very robust, sel- 

 dom have more than two divisions in the first fork ; the 

 stipes is winged, but the midrib vanishes at a distance 

 from the apex, and the involucre is seldom entire. 



Abundant. Australia. New Zealand. 



HymenopliytKin phyllantlius (Hook), St. — Fronds 

 ascending, 2 cm., simple or once furcate, shortly stipitate, 

 v/ith broad wings above; midrib rather slender; wings 

 thin, undulate ; margin entire. Perianth on ventral aspect 

 -close below the expanded portion of the frond, cylindric, 



H 



