322 University of California Puhlications in Botany [Vol. 10 



. Observations. — Belongs to the L. quadriloha group, from the type 

 species of Avhicli it is to be distinguished by the lobes of the leaves 

 and underleaves being much shorter. 



It comes nearest to L. Nova ZeaUmdia St., from the description, 

 but specimens of the latter which I have seen, collected by J. Meckle- 

 john near Lake Wakatipu, Ncav Zealand, and determined by Stephani, 

 indicate that it is a smaller and more delicate plant, irregularly 

 ramose, having leaves with larger cells, and underleaves much more 

 deeply divided. 



L. hrevipinna is recognized at once by its graceful, regular shape, 

 given to it by its short pinnae. 



Isotachis Lyallii Mitten 



Mitten in Fl. N. Z., II, p. 149, t. 100, f. 7. 



Ilahitat. — Pipiriki, North Island, New Zealand; coll. W. A. 

 Setchell, May 29, 1904 j no. 12. 



Isotachis minima sp. nov. 

 Plate 95 



Dioicous. Small; pale green to reddish brown in color; creeping 

 on other hepatics, terricolous. Stems prostrate, radiculose up to apex ; 

 rhizoids few. hyaline ; simple or with one branch ; cortical cells 40, 

 similar to the inner 10 X 32. Leaves ascending, often secund com- 

 plicate or very concave, outline broadly oval to rotund, bifid or trifid 

 to one-fourth or one-third, segments triangular, acute, sinus rounded 

 or acute, margin entire, rarely with a minute tooth near the middle; 

 cuticule smooth ; cells medium size, elongate, 4, 5, or 6-sided, walls thin, 

 no trigones, numerous chlorophyll bodies in the cells. Underleaves 

 transA'ersely inserted, erect, oval or broadly oval, bifid to nearly the 

 middle, segments triangular, acute, sinus rounded or acute, margin 

 unidentate on one or both sides near the middle. Androecia terminal, 

 3 or 4 pairs of bracts ; perigonial bracts smaller than the leaves, 

 ventricose at the base, exj)]anate (outline) broadly oval, bifid to 

 nearly the middle, segments acute, sinus rounded, wide, margin entire 

 or unidentate near the middle; perigonial bracteole oval, bifid to the 

 middle or nearly so, segments lanceolate, acute, margin entire or 

 unidentate; antheridia oval, 1, 2, or 3 in each bract. 



Dimensions. — Stems y_^ to % ii^^h long, with leaves 1 mm. wide; 

 diam. of .stem. .3 mm. ; leaves 1.25 mm. X 1 mm., seg. .3 mm. ; 

 1 mm. X 1 mm., seg. .3 ram. ; .9 mm. X -9 mm., seg. .3 mm. ; .8 mm. X 

 .7 mm., seg. .3 mm. ; cells .04 mm. X -02 mm. ; underleaves .75 mm. X 

 .75 mm., seg. .3 mm.; .6 mm. X .5 mm., seg. .3 mm.; perigonial bracts 

 .7 mm. X .6 mm., seg. .25 mm. ; perigonial bracteole .5 mm. X .3 mm., 

 seg. .2 mm.; antheridia .2 ram. X .15 mm. 



Habitat. — Whakerewarewa. Tlotorua. North Island, New Zealand; 

 coll. W. A. Setchell, 1901. no. 155. Tvpe. Herb. Univ. Calif., no. 

 213715. 



