150 EVANS 



slightly arched, free margin nearly straight, outer portion (in- 

 cluding apical tooth) appressed to lobe, inner portion slightly 

 involute, sinus shallow and lunulate, apical tooth short, blunt, 

 slightly curved, papilla in a distinct depression, making the 

 lobule appear bidentate at the apex when flattened ; leaf-cells 

 plane, averaging 15 /j. at the margin of the lobe, 21 n in the 

 middle and 30 x 23// at the base, thin-walled, trigones and in- 

 termediate thickenings minute but distinct, not confluent ; basal 

 ocellus measuring 55 x 28 ft, strongly inflated, assisting in the 

 formation of the water-sac, remaining ocelli scarcely larger 

 than the other cells, sometimes indistinct, variable in number 

 but sometimes as many as 8, irregularly scattered through lobe 

 or arranged in from 1 to 3 interrupted and indistinct longitudinal 

 rows; underleaves distant, 0.05 mm. long, 0.085 mm - wide, 

 basal portion rectangular or trapezoidal in outline, abruptly con- 

 tracted to a narrow line of attachment, consisting of a radicellif- 

 erous portion with or without a rudimentary disc and 6 marginal 

 cells, the median marginal cell on each side rounded to obtuse, 

 setae widely to obliquely spreading, 0.07 mm. long, 0.01 mm. 

 wide, usually composed of 3 cells in a single row, rarely 2 cells 

 wide at the base ; inflorescence dioicous ; female inflorescence 

 borne on a simple and very short branch (with one leaf and one 

 underleaf besides the involucre), bracts and bracteoles in unfer- 

 tilized flowers suberect ; bracts complicate, unequally to sub- 

 equally bifid, the lobe oblong, 0.37 mm. long, 0.17 mm. wide 

 (maximum measurements), rounded to obtuse at the apex, mar- 

 gin entire, lobule narrower, ligulate-oblong, 0.34 mm. long, 0.09 

 mm. wide, apex mostly blunt, margin entire ; bracteole some- 

 what connate on both sides, oblong, 0.37 mm. long, 0.13 mm. 

 wide, bifid one sixth or less with a sharp sinus and erect, triangu- 

 lar divisions, acute to rounded at the apex, margin entire or 

 nearly so, ocelli mostly 2 to 4, scattered ; male inflorescence 

 terminating the stem or a branch, bracts in 2 to 4 pairs, imbri- 

 cated, inflated, very shortly and subequally bifid with rounded 

 divisions, keel strongly arched, minutely crenulate in outer part, 

 bracteole present at base of spike, similar to the normal under- 

 leaves but smaller; mature perianth and sporophyte not seen. 

 Type locality, Akinokavva, Tosa, on leaves of Gymnogramme 



