120 JUNGERMANNIACEAE 
in general aspect from the usual form of the var. rivularis owing to 
the proportionally broader leaves which, in drying, are commonly 
semivertical or somewhat wrapped around the stem. This grew 
in very cold swiftly running water. 
Jungermannia aquatica Schrank is sometimes quoted as a 
synonym of Chiloscyphus polyanthos rivularis. If a true synonym, 
the name афиайса would replace rivularis, according to the pro- 
visions of the Rochester Code. But, personally, we are not fully 
convinced that Jungermannia aquatica Schrank is really such a 
synonym. Schrank’s description would, perhaps, on the whole, 
apply equally well to Jungermannia cordifolia Hook. 
25. GEOCALYX * Nees, Naturgesch. Eur. Leberm. 1: 97, 102. 
1043 (ғар ctl. а: 305: 1836. 
Calypogia Dumort. Syll. Jung. 73. 1831. Not Calypogeja 
Raddi, Atti Soc. Ital. Sci. Mod, 18 :—(33). 1818. 
Saccogyna Lindb. 7. р. Not. Sallsk. Fauna et Flora Fenn. For- 
handl. 13: 377. 1874. Act. Soc. Sci. Fenn. 10: 509. 1875. 
Schiffn. р. р. Eng. & Prantl, Nat. Pflanzenfam. 13: 93. 1893. 
Plants resembling in habit Lophocolea and Chiloscyphus. Stems 
creeping, simple, or with a few branches, these springing from the 
axils of the underleaves or latero-ventral ; root-hairs usually few, 
mostly from near the bases of the underleaves. Leaves alternate, 
succubous, bidentate or bilobed, slightly decurrent dorsally. Un- 
derleaves present throughout, much smaller than the leaves, bifid 
to the middle or below, free or connate with the leaf-base on one 
side by a very narrow isthmus. Androecium on a short branch 
from the axil of an underleaf, 4 bracts considerably smaller than 
the leaves, unequally and for the most part acuminately bilobed, 
with an additional tooth or lobule on the dorsal margin ; antheridia 
single or less commonly in pairs, short-stalked, without paraphyses 
Archegonia few, terminal on a very short branch springing from 
the axil of an underleaf, the branch in its further development be- 
coming a fleshy pendulous subterranean sac (perigynium) enclos- 
The differences in vegetative characters between Geocalyx graveolens ий 
супа viliculosa ате so Striking that we feel unwilling to follow Lindberg, Carringto" 
Schiffner, Bescherelle, and Kaalaas in reducing Geocalyx to Saccogyna—at least шій 
we have had an opportun 
intermediate position, 
: — : an 
ity of examining the exotic species which are said to hold 
bio 7% 
KE ER 
