a 
1904] JOHNSON—MONOCLEA 203 
GorseL, K., Organographie der Pflanzen. 1898-1901. 
GortscHE, C. M., LrnpBer«, S. O., and NEES von EsENBECK, Synopsis Hepati- 
carum. 1844-1847. 
GorrscHr, C. M., Ueber das Genus Monoclea. Bot. Zeit. 16: 281-287, 289- 
292. pls. 7-8. 1858. 
, Hepaticae Mexicanae. Kongl. Dansk. Vidensk. Selsks. Skrift. 1867. 
Hooker, W. J., Musci Exotici. 2: pl. 174. 1820. 
» Monoclea crispata. Botanical Miscellany 1:117. pl. 27. 1830. 
Lertces, H., Untersuchungen ueber die Lebermoose. 3:1877; 4:1879; 6:1881. 
Montacne, C., Boschia, Nouveau genre de la famille des Hépatiques, etc. 
Bull. Soc. Bot. France 3:572. 1856 
Ruce, G., Beitrige zur Kentniss der Vegetationsorgane der Lebermoose. Flora 
77: 282-293. pl. 4. 1893. 
ScuirrNer, V., Hepaticae. Engler und Prantl Natiirlichen Pflanzenfamilien 
13, —~, 18 
93- 
Taytor, T., Hepaticae Novae Zelandiae. London Jour. Bot. 3:574. 1844- 
~—> Hepaticae Antarcticae. London Jour. Bot. 4:96. 184 
EXPLANATION OF PLATES XVI AND XVII. 
PLATE XVI. 
Fic. 1. View of upper surface of part of a male thallus, showing branching 
and three generations of male receptacles. X1.5. 
_ Fic. 2. Transverse section of a male plant through a mature receptacle. 
5- : 
Fic. 3- Longitudinal section of male plant through receptacles of two gen- 
erations. x 2: 
: F 16. 4. Diagrammatic view of upper surface of a half-grown male receptacle 
ees growing point; the dotted outlines indicate the location of the anthe- 
| 2 
Fic. 5. Similar view of a male receptacle with two growing points. X 25. 
Fic. 6, Upper anterior part of a longitudinal section of a young male recep- 
Pre wmig very young antheridia. X 350. 
Pos 9 . Longitudinal section of a young male receptacle, passing just at one 
..- Sfowing point; the dotted lines indicate the position of the growing 
Point in an adjoining section. x 28, 
Fic. 8a, Surface view of 
nearly mature spermatozoid, showing the inter- 
twisted chromatin fibers. X 1500. : 
F . 15 
Rldtion : ‘enseeag of an optical section of such a spermatozoid, showing the 
7 rosa fibers still more clearly. X 4000. 
indicate s edian longitudinal section of an older male receptacle; the letters 
Nes — of origin of the antheridia. x 30. Beale 
ie ee Oung antheridium and surrounding cells from a section similar — 
