﻿of North America. 5 



Spores fuscous or black. 



Pseudo-elaters mostly of 1-4 elongated (2-10:1) cells. 



Pseudo-elaters 12- 18 // in width ; spores 35-58 fi in maximum diameter, the 



outer face with numerous (75-125) spines or papillae 3 ft or more in length ; 



involucre 1-5 mm. high. 7. A. punctatus. 



Pseudo-elaters 8-14 fi in width; spores 45-63 fi in maximum diameter, the 



outer face with very numerous (125-225) spines or papillae less than 3/z in 



length (or sometimes longer in var. stomatifer) ; involucre 2-9 mm. high 



(Pacific coast). 



8. A. fusiformis. 



Pseudo-elaters mostly of single celts about as broad as long, these sometimes in 



catenulate groups or variously adherent,or fragmentary and inconspicuous. 

 Spores 70-100 fi in maximum diameter, scarcely angled ; capsule 8-20 mm. 



long. 



9. A. Savenelii. 



Spores 48-65 [i in maximum diameter, rounded-tetrahedral ; capsule 3-6 mm. 

 long. 10. A. Alacounii. 



i. Anthoceros laevis L. Sp. PL 2: 1 1 39. 1753. 



Anthoceros Oreganus Aust. Bull. Torr. Bot. Club, 6 : 26. 1875. 

 Anthoceros Mohrii Aust. Bull. Torr. Bot. Club, 6: 304. 1879. 



Thallus nearly smooth and flat, rarely with elevate-crispate 

 margins, dark green, exhibiting a somewhat fatty lustre, subradi- 

 ately dissected, ecostate ; 'major segments irregularly obovate or 

 obcuneate, 4— 1 5 X 2-5 mm., once or twice subdichotomously cleft, 

 rounded or emarginate at apices, 6-8 cells thick in the middle, be- 

 coming gradually 3- or 2-stratose toward the very rarely glandular- 

 thickened margin; surface-cells mostly indistinct after drying, sub- 

 rhombic to long-hexagonal, 30-105 X 24-40 /i, the inner cells much 

 larger, hyaline, without evident air- or mucilage cavities : monoi- 

 cous (polyoicous ?): involucres' sometimes in pairs, cylindrical, com- 

 monly father slender, at maturity usually more or less widened 

 above and trumpet-shaped,. 8-2. 5 X .4-1.3 mm., the mouth entire, 

 repand or sublobate, sometimes plicate, rarely scarious: capsule 

 I 0-35 (mostly 20-25) X .25-42 mm., light brown, with a very short 

 pedicel, the valves often much twisted; spores yellow, thickly 

 granulose-papillate, especially on the convex (outer) face, 35-56 ji 

 in maximum diameter; pseudo-elaters nearly colorless to light yel- 

 lowish-brown, of 1-4 cells, geniculate, often branched, the cells 

 extremely variable in size and form. 



Exsicc. Drumm. Muse. Am. (So. States) 1841, no. 154 (as A. 

 pnnctatus)\ Hep. Bor-Am. 123; Hep. Am. 4. 



On moist ground, wet rocks, banks of rivulets and of roads. 

 Not uncommon throughout the United States, with the exception 

 of the Rocky Mountain region and the Pacific coast, where it is 



