FRULLANIA. 7 
merge into those of the next so that no limit is assignable, and (in my 
judgment) it is best to preserve the genus Frullania entire, excluding 
only Jubula, which is truly sui generis.* 
CLAVIS SUBGENERUM. 
A. Perianthium in sectione 4-gonun, i.e., postice bicarinatum, interdum, 
e carinulis interjectis, pluricarinatum., 
i, CHONANTHELIA.—Caulis vage pinnatim ramosus. Foliorum lobulus 
grandis, plerumque apice solum cucullatus (galeatus vel probosci- 
formis), inferne planus, longe lingulatus. 
B. Perianthium in sectione 3-gonum, carina postica unica (raro 
yemina). 
_a. Perianthium tuberculis villis sywamulisve asperwm. 
2. TRACHYCOLEA.—Caulis vage pinnatus. Lobulus alte galeatus, basi 
truncatus. a 
b. Perianthium glabrum, sepe nitidun. 
3. HomorropantHa.—Caulis pinnatim decompositus. Lobulus minutus, 
conchzeformis vel saccatus, plerumque retroversus. Flores monoici, 
creberrimi, ramulis brevissimis seriatim secundis constantes. 
Perianthium suberostre. 
4. Merroriopsis.—Caulis longissimus, pro more pendulus, pinnatus vel 
bipinnatus, apice indefinite crescens. Folia profunde cordata, cauli 
circumvoluta ; lobulus erectus parvus tenui-cylindricus. Foliola 
angustiuscula, margine plano. Flores dioici, 2 cladogeni. Peri- 
anthium longirostre. 
5. THYopsIELLA.—Caulis ad Thujz instar concinne pinnatim ramosus, 
apice determinatus. Folia basi semicordata, lobulo cauli approxi- 
mato, seepius erecto, saccato, cylindraceo. Foliola ovali-rotunda, 
toto margine recurvo. Flores constanter dioici, in plurimis acro- 
geni. Perianthium rostellatum 3- (rarissime pluri-) carinatum, in 
paucis speciebus perfecte teres. 
6. DtastaLopa.—Plantz pusille, caule pinnato vel bipinnato, ramulis 
seepe microphyllis. Folia basi plerumque rotundata, vix semi- 
cordata, lobulo brevi saccato, a caule remoto, semper fere obliquo. 
Foliola subplana. Flores acrogeni, plerumque monoici. Peri- 
anthium rostellatum, interdum obcordatum, rarius pluricarinatum. 
* See, for much valuable information on the structure of the capsule, 
measurement of spores, &c., of the Jubulew, J. B. Jack’s Review of 
Dumortier’s ‘‘ Hepatice Europee,” in the Botanische Zeitung for 1877. 
