896 CRYPTOGAMIA. Class XXIV. 
** Theca dekiscetit. Penstome absent. 
2218. ScMstostega. Fruitstalks terminal ; mouth of theca naked. Lid laciniated, with deciduous segments. 
2219. Gymnostdmum. Fruitstalk terminal. Calyptra dimidiate. Mouth of theca naked. 
*** Theca dehiscent. Peristome present. 
f Peristome single. 
2220. Hymenostomum. Fruitstalk terminal. Peristome destitute of teeth, but having an inner horizontal 
membrane perforated in the middle. 
2221. Tetraphis. Fruitstalk terminal. Peristome of 4 erect teeth. 
2222. Encalypta. Fruitstalk terminal. Peristome single of 16 teeth. Calyptra cylindrico-campanulate, 
wholly concealing the nature of the theca. 
2223. Grimmia. Fruitstalk terminal. Peristome single, of 16 entire or perforated rarely cleft teeth. 
Calyptra mitriform. 
2224. Weissia. Fruitstalk terminal. Peristome single, of 16 entire equidistant teeth. Calyptra dimidiate. 
2225. Dicranum. Fruitstalk terminal. Peristome single, of 16 bifid equidistant teeth. Calyptra dimidiate. 
2226. Trichostomum. Fruitstalk terminal. Peristome single, of 16 equal teeth divided to the base, or 32 in 
pairs. Calyptra mitriform. 
2227. Cinclidotus. Fruitstalk terminal. Peristome single, of 32 filiform twisted teeth anastomosing at their 
base. Calyptra mitriform. 
2228. Tortula. Fruitstalk terminal. Peristome single, of 32 filiform twisted teeth, nearly free, or more or 
less united by a tubiform membrane. Calyptra dimidiate. 
2229. Pterogonium. Fruitstalk lateral. Peristome single, of 16 entire equidistant teeth. Calyptra dimidiate. 
2230. Didymodon. Fruitstalk terminal. Peristome single, of 16 bifid equidistant teeth. Calyptra di- 
midiate. 
2231. Splachnum. Fruitstalk terminal. Peristome single, of 8 geminate teeth. Theca with an evident 
apophysis. Columella exserted, capitate. Calyptra mitriform. 
2232. Conostomum. Fruitstalk terminal. Peristome simple ; teeth solitary, entire, separate at base, 16 in 
number, united at the tips. 
ft Peristome double. 
2233. Orthotrichum. Fruitstalk terminal. Peristome mostly double ; outer one of 16 teeth, approaching in 
pairs ; inner one of 8-16 ciliary processes or none. Calyptra mitriform. Columella capitate. 
2234. Zygodon. Fruitstalk terminal. Peristome double or simple ; teeth in pairs. Calyptra cucuUate. 
2235. Diphyscium. Fruitstalk terminal. Peristome always double } outer with 16 teeth : teeth obscure. 
Theca subsessile. 
EVAGINULATI. 
Systematic 
Name and 
Authority. 
Time of 
flowering, or 
when most 
conspicuous. 
Locality. 
Reference 
to Figures. 
2216. SPHAG'NUM. L. Sphagnum. 
14650 obtusifolium Ehr. blunt-leaved aquatic 
« vulgaris Hooker common aquatic 
S. iatifolium E. B. 
/3 minus Hooker small aquatic 
yfluUans Turner floating aquatic 
14651 squarrosum Web. squarrose aquatic 
14652 acutifolium Ehr. sharp-leaved aquatic 
capillifolium E. B. 
14653 cuspidatum Ehr. cuspidate aquatic 
Sp. 4—11. 
7 all months 
7 all months 
3 all months 
24 all months 
7 all months 
6 all months 
Y.G 
Y.G 
Y.G 
Y.G 
Y.G 
Y.G 
bogs 
bogs 
bogs 
all months Y.G bogs 
Muse. brit. t.4 
Eng. bot. 1. 1405 
Schwcegr.sup.t.3 
Muse. brit. t.4 
Muse. brit. t.4 
Muse. brit. t.4 
2217. PHAS'CUM. L. 
14654 serratum Schreb. 
VAGINULATI OLOCARPI. 
Phascom. 
serrated 
stoloniferum E. B. t.2106 
solitary 
Sp. 11—39. 
spring 
Pa.G shady banks Muse, brit.t.5 
History, Use, Propagation, Culture, 
2216. Sphagnum. A name employed bv Pliny to distinguish some kind of moss that grew upon trees. In 
this genus the theca is sessile, being entirely destitute of a real fruitstalk. That which appears like one is the 
footstalk of the receptacle, which in most of the Sphagna is so much lengthened out as greatly to exceed tne 
perichgetial leaves. All the species agree in the peculiar structure of the leaves, of which the reticulation is 
