278 PLANTiE CELLULOSE APHYLLEE. 
Thallus solid, fleshy; covering 
membranaceous ; sporidia scattered 
within the substance SARCOTHECEE. 10. 
Thullus cellular, fleshy ; sporidia 
in oblong thecae on the membra- 
naceous covering HYMENOTHECEE. 11. 
Thallus fleshy ; sporidia in longi- 
tudinal thecae on the deliquescent 
covering LYTOTHECEE. 12. 
Fam. I. 1. HYDROPHYTE. Algarum pars, Linnaeus 
and Jussieu. 
Tliallus tubular, membranaceous, leatherlike or gelati- 
nous, continuous or jointed; tubes filled with sporidia; 
sporidia globose or elliptical ; plant aquatic, rarely marine. 
A. Thallus not jointed ; sporidia transverse , in a single 
longitudinal row , within the tube. Oscillatorideae. 
Threads gelatinous, simple, several to- 
gether enclosed in a cylindrical sheath . . . Vaginaria. 1. 
Threads gelatinous, simple, decumbent, 
upon a gelatinous stratum Oscillatoria. 2. 
Threads gelatinous, simple, decumbent, 
free, tranquil Humida. 4. 
Threads gelatinous, tufted, upright, 
free, tranquil Elisa. 4. 
Threads gelatinous, upright from a 
common centre, forming a mass Rjvularia. 5. 
Threads leatherlike, free Scytonema. 6. 
B. Thallus not jointed ; sporidia in many transverse an- 
nular series. Bangidese. 
Sporidia globular Girardia. 7. 
C. Thallus not jointed ; sporidia in tufts , on the inside of 
the tube. Lemanideoe. 
Threads torulose ; sporidia elliptical Lemania. 8. 
D. Thallus not jointed ; sporidia scattered in the tube and 
branches . Yaucherideae. 
Thallus pinnate; branches linear Bryopsis. 9* 
