PORELLA 167 
18. About one fourth of perianth-mouth, Ж 53. 
Figs. 1, 12, 13, and 18, drawn from no, 994 (Blue Lake, Humboldt Co.) ; 2, 
from no. 759 (Ukiah) ; 3, from no. 1109 (Hay Fork, Trinity Co.) ; 4, from no. 1168 
(Mill Valley) ; 5, 6, 8-10 and 14-17, from a portion of the original material collected 
by Roell at Kitchelos Lake, Washington, and communicated to Professor Underwood 
by Herr Stephani; 7 and 11, from no. 1068 (Deer Creek, Humboldt Co. ). 
4. PoRELLA NAVICULARIS (Lehm. & Lindenb.) Lindb. Act. Soc. 
за. Penn. 9: 337. 1860. 
Jungermannia navicularis Lehm. & Lindenb.; Lehm. Pugill. 6: 
38. 1834. 
Madotheca navicularis Nees, р. р. С. L. М. Syn. Нер. 277, 
1845. 
Madotheca Douglasii Tayl. Lond. Jour. Bot. 5: 3 79. 1846. 
Madotheca Californica Hampe, in herb. Sullivant, fide Austin, 
Hep. Bor.-Am. ог. ; 
Shining or more rarely dull, brownish-yellow, large: stems 
somewhat regularly bipinnate, 4-12 cm. long, procumbent-caespi- 
tose, or subpendulous with apices ascending when moist, branch- 
lets gradually narrowed, subacute, convex on drying and slightly 
deflexed : dorsal lobes of leaves densely imbricate, appressed, for 
the most part closely wrapped about the stem when dry, obliquely 
orbicular-ovate to oblong-ovate, 1.2-2. 5 mn 1-1.8 mm., 
rounded-obtuse, apex decurved, subcucullate, inferior margin 
slightly undulate-crisped, the superior decurrent, its wing some- 
times laciniate-crispate, otherwise very entire, the inferior basal 
angle composed of numerous small thick-walled cells -14 the 
diameter of the remainder, trigones conspicuous throughout ; ven- 
tral lobes ovate, obtuse, most rarely subacute, regularly rounded 
outwardly at Базе, .5-І mm. x .33—75 mm., a little smaller than 
the underleaves, length somewhat more than ¥% the width of the 
teole wide; perianth broadly obovate from an obconic somewhat 
inflated base, scarcely narrowed above, deeply bilabiate, the lips at 
first subciliate-denticulate, later obsoletely crenulate-dentate or 
nearly entire, strongly revolute, giving perianth the appearance of 
being squarely or obliquely truncate: capsule ovoid, yellowish- 
brown, exserted by about its own length; spores 50-85 и, echinu- 
