. INTRODUCTION TO BOTANY. 221 
FERNS. 
Stipes. ‘The stem, or rather leafstalk of a fern, as it is. 7 
not alike on every side. PI. 8, fig. 8. sg 
Sori. The groups-of capsules, usually seated on the back 
of the frons or leaf. Pl. 19, fig. 15. 
Involucrum, Indusium, Membranula, Glandule squamose. 
A membrane that covers the sori, when young. PI. 19, 
fig. 15. 
See oale, Capsula. The vessel containing the sporee, 
usually torn open when ripe by the force of the elastic ring. 
Pl. 19, fig. 15 b, 16 and 17. 
Elastic ring, Annulus elasticus, Gyrus, Gyroma. A stron 
ligamentous belt surrounding the capsules. Pl. 19, fig. 16 
and 17. 
LycopropiacEa, &c. 
Involucrum. 'The indehiscent envelope of the spori of the 
marsileacez. . 
Conceptacles, Conceptacula, Nephrosta. The coques that 
contain the sori of the lycopodiacee. PI1.19, fig. 3, 6,7 
and 11. 
Mosses. 
Surculus. The stem of a moss. 
Perichetium, Perocidium, Perigonium. An involucre 
composed of small floral leaves which surround the base of - 
the organs of reproduction in mosses. PI. 20, fig. 7, 11. 
Pericheetial leayes, Folia perichetialia. Imbricated, leaf- 
like organs surrounding the reproductive organs. PI. 20, 
fig. 11 a. 
pare Fila succulenta. Fistular hairs divided into 
cells, intermixed with the organs of reproduction in the 
perichetia of mosses. PI. 20, fig.6 e, 11 b. 
Urn, Capsule, Urna, Theca, Pyxidium, Capsula, Sporan- 
gium, Anthera, Aggedula. 'The fruit of the mosses. Usually 
dry, oblong or round, and covered with an operculum, 
which separates when ripe by a transverse division. Pl. 20, 
fig. 3, 4, 5 g, 9,10, 12, 14, 17. ; 
Calpa. ‘The urn of fontinalis. 
Pedicell. Seta, Stipes, Pedicellus. The footstalk that 
supports the urn. PI. 20, fig. 4, 8 a. : 
Gynocidium. A small enlargement at the base of the 
pedicell. 
Vaginule, Vaginula. A small membranaceous sheath 
that surrounds the bottom of the pedicell. 
