SCAPANIA 151 
unicellular, spherical or oval, 15-20 м, occasionally in branching 
moniliform threads: dioicous: 4 and Ф plants mingled or in 
separate tufts, ¢ plants more slender: androecium terminal, 
4 bracts smaller, approximate or rather distant, more rarely 
subimbricate, ventricose, lobes nearly equal, the dorsal often cal- 
carate-dentate at base, antheridia 2-6, accompanied usually by a 
very few short capillary or sometimes leaf-like paraphyses : perianth 
oblong or obovate, truncate, denticulate or subentire at the mouth. 
On moist banks. Mendocino (590, 4); near Eureka |045, 
946 (с. рег.) and Kneeland Prairie Road (1025), Humboldt Co. 
Scapania Oakesti, as represented in Austin’s Hep. Bor.-Am., 
no. 14, and in two other specimens from herb. Austin in herb. 
Underwood (all from the White Mountains of New Hampshire) is 
a large plant evidently very closely related to Scapania undulata 
purpurea. Our plants are usually smaller, more copiously sub- 
ciliate-dentate on the carina, and have more resemblance super- 
ficially to S. nemorosa, yet are certainly distinct from either of the 
species named. They accord very closely with Dr. Scouler's 
specimens from Observatory Inlet, in herb. Torrey, which Austin 
made var. 9 of Scapania Oakesii. In some of the Eureka plants 
the carina is richly provided with teeth as far as the seventh or 
eighth pair of leaves from the stem-apex. 
PLATES 108 AND 109. SCAPANIA OAKESII. 
1. Plants, natural siz 
2. Perianth and ніна; наран view, Х 12. 
3 and 6. 2 plants, X 12, the former gemmiferous at apex. 
4. Apical portion of a 9 =. dorsal view, 12. 
4 Perianth and bracts, dorsal view, Х 12 
7. 4 bract and antheridia, Х 2 
8. Antheridium, 53. 
9. Antheridial paraphyses, X 106 
то and 11. Leaves from near the stem-apex of a sterile 9 plant, Х 23. 
12. Leaf, ventral view, X 23. 
13. Leaf from lower part of stem, carina entire, 23. 
14. 9 bract, Х 23. 
15. Leaf-cells from near apex of ventral lobe, Х 305. 
16. Portion of perianth-mouth, Х 53. 
17. Margin of apex of ventral lobe, 106. 
1, 3, 4, 6-13, 15, and 17, from no. 946 (near Eureka); 2, 5, and 14, from 
no. s м зе Eureka); 1 16, from no. 1025 (Kneeland Prairie Road). 
