393: 
Marin and San Mateo counties, California,* but a scrap of it had 
been previously collected (1888) with Polytrichum by Miss M. E. 
Parsons, of San Rafael, and overlooked in my collection. It is 
found mostly on the ground and is an interesting addition to our 
flora. It has long been known in Europe, but does not appear to © 
be common. It was distributed in Hep. Am. 174, from fine ma- 
terial sent by Mr. Howe. The species has been illustrated in Smith, 
Engl. Bot. p/. 2570 and in Ekart, Syn. Jung. Germ. pl. 9, f. 69 in 
addition to the citation of Hooker above. 
Species dubiae et inquirendae. 
CEPHALOZIA DENTATA (Raddi) Spruce,On Cephalozia, 71. 1882. 
: Jungermannia dentata Raddi, Mem. Soc. Mod 18: 22. pl. 4. fi 4. 
1818, 
(This species was reported by Mitten, Jour. Linn. Soc. 8: 52, 
1865, under the name Trigonanthus dentatus, from Galton Moun- 
tains, British Columbia, but as it is not otherwise known from 
North America the identification needs to be verified.) 
CEPHALOZIA CONNIVENS (Dicks.) Dumort, Recueil d’ Obs. sur les 
Jung. 18. 1835. 
Jungermannia connivens Dicks. Pl. Crypt. Brit. fasc. 4: 19. pi. 
Al. foT5. ° ¥8or. 
Cephalozia multifora Lindb. Acta Soc. Sci. Fenn. 10: 501. 1875. 
(not Spruce /. ¢.) 
(This species has been frequently reported from America but 
has been confused with C. media. It is likely to occur northward 
and can be distinguished from that species by its large leaf-cells 
(664 in diameter) and its perianth formed of a single layer of cells, 
with long ciliate mouth.) 
* 
os 
The publication of a revision like the above is often accepted 
by botanical collectors as an indication that the information re- 
Sarding the genus is closed. Asa fact such a revision merely in- 
dicates the extent of our knowledge for the present and forms a 
datum line for further study. It also shows or ought to show the 
limitations of our knowledge. The remarks to follow apply not 
only to the genus Czphalozia, but to all genera and species of He- 
ee ne 
* Erythea, 4: 50. 1896, 
