dbb NATURAL HISTORY. 



SECOND DIVISION. 

 CELLULAR PLANTS. ACROGENS. 



These plants (Acyotogamous acrogens) are composed 

 entirely of cellular tissue, and without vessels or ducts, 

 producing spore-cases or capsules, opening by a terminal 

 lid, and contain simple spores only, in this differing from 

 the foi'egoing. 



FIRST SUB-CLASS. CELLULAR PLANTS WITH LEAVES 



Possess leaf-like extensions and imperfectly developed 

 organs of fructification ; have no primary root ; the axis 

 growing from the apex only has no provision for increase 

 in diameter as they increase in age. Acrogens Acro- 

 genous Plants (Greek derivation) means that they grow 

 from the apex alone. 



SEVENTY-FIRST FAMILY. HEPATIC^E. LIVERWORTS 

 Are small moss-like plants, the stem and leaves form- 

 ing or confluent into an expanded leaf-like mass. 



The Marchanzie or Brook Liverwort (Marchantia 

 polymorpha.) has large, cellular lobes, resembling oak- 

 leaves ; common, and growing beside brooks, springs, or 

 by damp walls. Leaves are at first orbicular ; first year 

 only one inch long ; calyptra (hood) opening at apex. 

 Withers on the spot where it grew, rooting or ramifying 

 from the free end. 2 . 



SEVENTY-SECOND FAMILY. Musci. HAIR CAP 

 Moss. 



YeHoiv Maiden Hair (Polytrichum commune). This 

 beautiful moss is about one foot high, has small branches 



