Azolla\ SALVINIEJ3. 101 



spores ; the smaller sort bursting transversely, containing rounded 

 ant/teridia, produced on a central erect column. 



The above description is mainly adapted from " Hooker's Hand- 

 book," which again had borrowed it from Prof. Gray's " Manual of 

 the Botany of the North United States." The genus is imperfectly 

 known, the only monograph on the subject being "Ueber AzoUa," 

 published by Prof. Strasburger, of Jena (in 1873), in which the 

 affinities and structures are discussed, and four genera are described. 

 There is no English translation of this work. 



1. A. flliculoid.es, Lam. ,- var. rubra. 



Fronds reddish, ovate-orbicular, or somewhat triangular, J--2 in. in 

 •diameter, pinnate ; branches close-set, almost imbricating, somewhat 

 palmate. Leaves densely imbricate, ovate, entire, obtuse, -^^ in. 

 long, smooth on the upper surface. Roots longitudinally plumose 

 beyond the middle. 



Synonym. — A. rubra, Br. 



Distribution. — Tasmania and Australia. , 



A very common plant in pools and ditches in most parts of New 

 .Zealand, forming a reddish mantle on the surface of the water. It 

 is not only a beautiful little plant, but is a most interesting study 

 under the microscope. In tanks or aquaria containing a sufficient 

 supply of soil at the bottom of the water it may be grown very 

 readily, but it requires a constant change of the water. 



Order V.-LYCOPODIACE^. 



(The characters of the Order are given at p. 18.) 



Minute plant.; leaves radical, linear, 

 surrounding a leafless peduncle 

 which bears at its apex a short 

 spike formed of imbricating 

 scales, each of which covers a 

 solitary capsule 1, Phylloglossum, 



Stems branching, with small leaves, 

 usually crowded in 2 or 4 rows. 

 Capsules solitary in the bracts of 

 terminal spikes or the upper 

 leaves of the stem 2. Lycopodium. 



Stems leafy, simple ; leaves rather 

 large. Capsules 2-celled, solitary 

 and sessile in the axils of the 

 leaves 3. Tmesipteris. 



