NARDIA 93 
19. NARDIA S. F. Gray [as Nardius| р. р. Nat. Arr. Brit. Pl. 
I: 604. 182. 
Mesophylla Dumort. Comm. Bot. 112. 1822. 
Айсшата Corda ; Opiz, Beitr. 6 $4. 18207 
Plants medium-sized or small. Stems creeping or ascending, 
rarely suberect, simple or with a few latero-ventral branches : root- 
hairs usually long and numerous, often reddish. Leaves alternate, 
obliquely inserted and succubous or nearly transverse toward the 
perianth, often vertical-connivent, subreniform to orbicular-ovate, 
entire or merely repand, rarely retuse at apex, sometimes margin- 
` ate. Underleaves present, lanceolate or subulate, or (in our species) 
wanting. Dioicous or paroicous. Androecium in dioicous species 
terminal or median, 4 bracts saccate, otherwise similar to the 
leaves, antheridia mostly in groups of 2-4. Archegonia terminal 
on the main stem. © bracts 2—5 pairs: in the subgenus Димана, 
perianth and the hollowed-out stem-apex to form a perigynial tube, 
this sometimes ventrally bulbous-thickened, perianth small, rather 
delicate, included ; in the subgenus Eucalyx, perianth firm, much 
exserted, ovoid to obovoid-prismatic, 4—5-carinate and abruptly 
contracted to a short subtubular mucro at the mouth or carinae 
wanting and the apex conical and plicate, the superior bracts more 
or less adnate to perianth (or—more accurately, perhaps—borne on 
the excavated stem-apex). Calyptra free, surrounded at base by 
the unfertilized archegonia. Capsule globose-oval, dehiscing by 
straight rigid valves ; cells bounding the inner surface of the valves 
With numerous semiannular thickenings, those of the outer surface 
With columnar or nodular thickenings ; seta rather short ог moder- 
ately long. Elaters bispiral. 
Both of the species described below belong to the subgenus 
Eucalyx, which passes gradually into the genus Jungermannia. 
Nardia crenulata, in which the 9 bracts are often only very slightly 
adherent to the base of the perianth, stands on the border line be- 
tween Nardia апа Jungermannia and would be about equally well 
at home in either group. Лада scalaris (Schrad.) S. Е. Gray, of 
the subgenus Eunardia, has been collected by Professor Macoun 
on Vancouver Island and may be expected to occur in California. 
This may be readily distinguished from either of the following 
Species by the presence of lanceolate or subulate underleaves and 
by the Conspicuous trigones of the leaf-cells; the perianth is in- 
cluded within the involucre formed by. the bracts and bracteole. 
Ek in E RN Оа” 
* See footnote, Р. 33. 
