46 Illinois Stale Laboratory of Natural History. 



4. A csespiticius DeNot. Thallus dissected to the base, 

 the divisions 4 8.5 mm. long, narrow, variously lobed, expand- 

 ed at the apex, dark green, more or less glandular; involucre 

 broad, scarcely 2 mm. high, broadly sulcate and obtusely 2-an- 

 gled on the back, minutely punctate, the apex subtruncate, 

 repand-tridentate, the mouth narrowly scarious; capsule thick 

 1 1.5 cm. long, sessile, sulcate or angled, the apex obtuse and 

 subtruncate; columella thickish, fibrillose. (A. tuberosus 

 Tayl.) 



Hob. Tex.? Cal. (Eu.) 



Bib Syn. Hep. p. 588; Hep. Europ. p. 161 ; Torrey Bull. VI, 25. 



5. A. Hallii Aust. Thallus 1.3 2.5 cm. long, 1 2 mm. 

 wide, caespitose, often erect, linear or elongate-flabelliform, the 

 apex entire or slightly lobed, most usually glandulose-thick- 

 ened; involucre terminal, pellucid, pale green, 2 3 mm. long, 

 the apex truncate; capsule about 6 mm. long, short pedicelled. 

 sulcate, very narrow, the valves thick; spores smooth. 



Hab. On the ground and on rocks; Silverton and Salem, Ore. (Hall), 

 Marine Co., Cal. (Bolander). 

 Sib. Torrey Bull. VI, 26. 



6. A. Oreganus Aust. Thallus thin, glandular-thick- 

 ened in places, involucre very short, abruptly constricted above 

 the middle, inflated below, minutely and closely punctate, the 

 mouth subtruncate, slightly repand-lobate ; capsule sessile, 

 bulbous at base, somewhat thickened, about 1.3 cm. long, the 

 valves splitting to the mouth of the involucre, coherent at the 

 apex; spores small, indistinctly granulose. 



Hab. Ore. (Hall). 

 Bib. Torrey Bull. VI, 26. 



7. A. sulcatus Aust. Thallus 4 6 mm. long, deep 

 green, apparently hollow, caespitose, erect, attenuate at base, 

 flabelliform, the margin variously lobed and repand; involucre 

 obovate-quadrate, about 1 mm. high, somewhat roughened: 

 capsule 4 5 mm. high, narrow, erect, or somewhat curved, 

 sulcate, almost sessile, compressed-glandular; spores rather 

 large; elaters short. 



Hab. On moist earth; Salem, Ore. (Hall). 

 Bib. Torrey Bull. VI, 27. 



** Stot'px hl('k; el&ters fuscous. 



