204 PRACTICAL BOTANY. 



leaves. In these two particulars they clearly resemble the 

 Ferns with which they are classed as allies. The name of 

 the order is from two Greek words meaning wolf foot, 

 though the reason is not apparent why this name should 

 be given to these plants. It was possibly suggested by 

 the short hairy branches of Lycopodium clavatum. 



The Lycopodinse include the Little Club Mosses (Sela- 

 ginelleoe), which number about 335 species, mostly tropi- 

 cal ; seven are native to the United States. Many of the 

 tropical species are cultivated in greenhouses for their 

 delicate and beautiful foliage. In outward appearance 

 the Little Club Mosses resemble the Club Mosses, except 

 that they are much smaller. The characteristic that 

 distinguishes them is the production of two kinds of 

 spores, macrospores, usually four in number, and micro- 

 spores, of indefinite number. 1 



Here also are included the Isoeteoe, or the Quillworts. 

 The scientific name is from two Greek words meaning 

 equal and year ; it is appropriate, as these plants remain 

 the same throughout the whole year. The common name 

 is also appropriate because of the resemblance of the 

 leaves to quills. There are about 50 species in the 

 order ; 16 occur in the United States. Five of these 16 

 species grow submerged in water ; five grow in places 

 where they are wholly out of water in the dry season ; 

 the others grow partly in and partly out of water. The 

 leaves grow in bunches from a sort of bulb, varying in 

 number from 10 to 100, and in length from 2 to 20 inches. 



References for Reading. Goebel's " Classification of Plants," pp. 

 274-297 ; Parker's " Elementary Biology," pp. 371-373 ; Vines' " Text- 

 Book of Botany," pp. 421-430 ; Bennett and Murray's " Cryptogarnic 

 Botany," pp. 38-63, 115-119; Bower's "Practical Botany," pp. 261- 

 286. 



1 If time permits, arrange Practical Studies on the Horsetails, Club 

 Mosses, and Little Club Mosses. 



