474: THE CANADIAN NATURALIST. 



The inner peristome takes its origin from the outer wall of the 

 spore sac, and is a thin plicate, or keeled membrane, divided into 

 processes of cilia, which usually stand opposite the interspaces of 

 the outer teeth, and occasionally one to three still finer ciliola, 

 occur between the cilia (fig. 22). 



The spores are formed from the cells, filling the spore sac, and 

 are always free from the spiral threads found in the Hepaticse. 



In the above account I have not included the Sphagnina or 

 Bog-mosses, as the views of recent writers tend to separate them 

 as a distinct class, parallel with Mosses and Hepaticse. 



The Genus Botrychiuiu. — Dr. Milde has recently published 

 an elaborate monograph of this genus, in which he recognizes the 

 following species : — 1. B. Lunaria Swartz. 2. B. crassinervium 

 Ruprecht; a Siberian species. 3. B. boreale Milde; North Europe 

 and said to be North American. 4. B. matrlcaricefoUum A 

 Braun. 5. B. lanceolatitm Angstrom. 6. B. simplex Hitch- 

 cock. 7. B. tematum (Thunberg). 8. B. lanuginosum W allien. 

 9. B. daucifoUum Wallich. 10. B. Virginianum Swartz. 

 The first six species appear to be unduly numerous ; Mr. Baker 

 (very properly) condenses 2, 3, 4 and 5 into one, under the name 

 B. rutaceum Swartz giving 5 the rank of a variety, but he 

 recognizes 6 (which is hardly more than a variety of 1) to be a 

 good species. The normal form of 7 is a plant of East Asia ; 

 the European B, rutcefolium A. Braun, and the American B. 

 lunarioides, with its forms obliquum and dissectum, being reduced 

 to varieties : the latter form is more of an accidental ' sport' than 

 a botanical variety. Mr. Baker considers 8 to be a variety of 10 ; 

 8 and 9 are found only in East Asia. The normal form of 10, 

 well known to Canadian botanists, is found throughout America 

 from Canada to Brazil, and is widely dispersed in Europe and in 

 Asia. D. A. w. 



ERRATA. 



On page 38, line 7, for ' ten miles daily,' read ' ten inches daily.' 

 On page 431, line 28, for '263,' read '268.' 

 On page 432, line 28, for '576,' read '575.' 



On page 434, line 44, for '33,' read '53,' as the number of species in the 

 Northern States referable to Caryophyllaceee. 



