18 SYNOPSIS OF THE ORDERS. 



* Spores of only one kind ; prothallus bearing antheridia and archegonia. 



130. Equisetaceae (p. 675). Cylindric jointed hollow-stemmed plants, with 

 toothed sheaths. Fructification in a terminal spike. 



131. Filices (p. 678). Ferns, with fronds circinate in vernation, bearing the 

 fructification on the under surface or beneath the margin. 



132. Ophioglossaceae (p. 693). Fronds often fern-like, erect in vernation. 

 Sporangia globose, coriaceous, 2-valved, in special spikes or panicles. 



133. Lycopodiaceae (p. 695). Low moss-like plants with elongated stems 

 and small persistent entire several-ranked leaves. Sporangia solitary, 

 axillary, 1-3-celled, 2-3-valved. 



* * Spores of two kinds, the macrospore producing a prothallus with arche- 

 gonia, the microspore smaller and developing antheridia. 



134. Selaginellaceae (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. Marsiliaceae (p. 700). The two kinds of spores in the same or differ- 

 ent sporangia Avhich are borne in a coriaceous peduncled sporocarp arising 

 from a slender creeping rhizome. Fronds digitately 4-foliolate or filiform. 



136. Salviniaceae (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 de- 

 hisce by a lid and contain spores only, and the Hepatic.e, 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. Jungermanniaceae (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. Anthocerotaceae (p. 726). Thallus without epidermis, irregularly 

 branching ; pedicels stout or none. Capsule with a columella. Elaters 

 mostly without fibres. 



139. Marchantiaceae (p. 727). Thallus radiate or dichotomous, the epi- 

 dermis usually porose. Capsules borne on the under side of a pedunculate 

 receptacle, irregularly dehiscent. Elaters 2-spiral. 



140. RicciaceaB (p. 730). Thallus radiate or dichoromous, the epidermis 

 eporose. Capsules immersed in the thallus or sessile upon it, indehiscent-. 

 Elaters none. 



