BRYOPHYTA. 477 



1. SELAGINELLA Beauv. Prod. Aetheog. 101. 1805. 



Characters of family. [Name diminutive of Selago, ancient name of a 

 Lycopodium.] About 600 species, widely distributed, most abundant in trop- 

 ical regions. 



1. Selaginella Eatoni Hieron.; Small, Ferns Trop. Florida 67. 1918. 



Pale green, matted, the slender branches prostrate, 1-4 cm. long, creeping. 

 Leaves in two planes, those of the lower plane ovate to elliptic, spreading, 1.5 

 mm. long or less, abruptly acute or obtuse, sparingly setaceous-serrulate or 

 entire; those of the upper plane somewhat smaller, lanceolate, acuminate, 

 those subtending sporanges near the ends of the branches lanceolate or ovate- 

 lanceolate, acuminate-aristate; macrospores tubercled, about 0.2 mm. in 

 diameter. 



Moist shaded rocky situations, Abaco, Andros : Florida. Eaton's Selaginella. 



Phylum 3. BRYOPHYTA. 



Mosses and Liverworts. 



Small plants, producing minute usually spherical bodies, called 

 spores, in capsules, from which arise a protonema on which are 

 borne the plants bearing archegonia and antheridia, from which the 

 fruit is formed, which in turn bears spores. 



There are two classes which differ from each other as follows : 



Stems erect or prostrate, having leaves more or less equally developed on all sides ; 

 calyptra at the apex of the capsule. Class 1. Musci. 



Stems usually prostrate, with the leaves, when present, un- 

 equally developed on the upper and lower surfaces ; calyptra 

 at the base of the capsule. Class 2. IIepaticae. 



Class 1. MUSCI. 



Mosses. 

 Contributed by Elizabeth G. Britton. 



Terrestrial, epiphytic, or rarely aquatic plants, showing two 

 distinctly marked but closely connected and continuous phases of 

 growth, or alternate generations, usually having stem, leaves and 

 rhizoids but not true roots ; stems arising from a more or less 

 ephemeral protonema, which originates from the spore, forming 

 either a filamentous or thallose growth. Sexual organs borne either 

 apically or laterally on the stem, usually in special buds ; antheridia 

 and archegonia on the same plant or on separate plants ; antheridium 

 containing ciliate sperms ; archegonium a single egg, after the fer- 

 tilization of which the embryo develops into the fruit, rupturing the 

 walls of the archegonium in its growth ; the upper part of the 

 archegonium is carried up by the elongation of the pedicel, forming 

 the calyptra, which in many mosses covers and protects the capsule 

 while it is developing. Capsule usually with a central axis forming 



