﻿COMPENDIUM 



OF THE FAMILIES, TRIBES AND GENERA AS 

 FOLLOWED IN THIS WORK. 



ORDER FILTCALES 



Green plants with 2 distinct generations, a pro-embryonal and an em- 

 bryonal, the pro-embryonal consisting of a minute, tuberous, flat or filiform, 

 green or white, simple, entire, incised or branched thalloid plant (prothalliurn) 

 with hair-like roots and bearing one or more, cf and (or) 9, tuherculiforni 

 protuberances (antheridia, archegonia). The embryonal generation, i. e. the 

 normal, cormophytical plant with a solid, short or elongate, rarely tuberous 

 stem (rhizome or caudex) and true roots, stalks (stipes) and leaves (fronds), 

 traversed by one or more fibro-vascular bundles and producing capsules (spo- 

 rangia) with spores, developes when a ripe archegonium ( 9 ) i^ fecundated by 

 the spiral-shaped spenuatozoids of a ripe antheridium (cf). Fronds seriate 

 or circinate, rarely placed in whorls but then not connected, commonly more 

 strongly developed than I he stems, the fertile ones whether or not contracted, 

 rarely metamorphosed. (*) 



SUBORDER I. FIlilCES (Isospore Filicales, True Ferns). 

 Spores uniform, producing independent prothallia on which are developed 



(*) The other fern-allies being also green plants with 2 f;eneralions and fibro-vasctilar 

 bundles are readily distin{?uished from ihe Filfcales in having the fronds commonly less 

 strongly developed than the stems and by the following principal characters: 



Order Kquisetales. Fronds very small, in whorls, connected so as to form distinct, 

 toothed, longitudinally ribbed, tubular, ochrea-like organs enclosing the bases of the interno- 

 dations of the stems. Stems elongate, hollow. Sporangia placed on llie under side of meta- 

 morphosed, scale-like, peltate, stalked sporopiiylla forming terminal spikes. Spores uniform. 

 (1 Family). 



Order Lycopodiales. Fronds various, seriate, circinate or in whorls, not connected. 

 Stems tuberous or elongate, solid. Sporangia solitary at the base of the fronds on the upper 

 side, superficial or imbedded. Sporophylla forming close or lax terminal spikes on an elongated 

 stem or placed with the barren fronds in a dense rosette surrounding a tuberous stem. 

 Spores uniform or dimorphous. (4 Families). 



