[*][*] Spores of two kinds, the macrospore producing a prothallus with archegonia, the microspore smaller and developing antheridia.
134. [Selaginellaceæ] ([p. 697]). Low leafy moss-like or marsh plants, with branching stems, and small 4–6-ranked leaves, or with a corm-like stem and basal linear-subulate leaves, the two kinds of spores in distinct solitary axillary 1-celled sporangia.
135. [Marsiliaceæ] ([p. 700]). The two kinds of spores in the same or different sporangia which are borne in a coriaceous peduncled sporocarp arising from a slender creeping rhizome. Fronds digitately 4-foliolate or filiform.
136. [Salviniaceæ] ([p. 701]). The two kinds of spores in separate thin-walled 1-celled sporocarps or conceptacles clustered beneath the small floating fronds; macrospores solitary.
Subclass II. CELLULAR ACROGENS, or BRYOPHYTES.
Plants with cellular tissue only; both antheridia and archegonia borne upon the plant itself.—Including the Musci, or Mosses (which are not treated of here), never thallose, and bearing capsules which usually dehisce by a lid and contain spores only, and the Hepaticæ, which bear capsules which dehisce by valves or irregularly and usually have elaters mingled with the spores. The latter division comprises the following Orders.
[*] Capsule 4-valved; plant a leafy axis or sometimes a branching thallus.
137. [Jungermanniaceæ] ([p. 702]). Leaves, when present, without a midrib, 2-ranked, with often a third row beneath; pedicels slender.
[*][*] Capsule 2-valved, or dehiscing irregularly, or indehiscent; plant a thallus or thalloid stem.
138. [Anthocerotaceæ] ([p. 726]). Thallus without epidermis, irregularly branching; pedicels stout or none. Capsule with a columella. Elaters mostly without fibres.