308 



MANUAL OF POISONOUS PLANTS 



EMBRYOPHYTA ZOIDIOGAMA 



BRYOPHYTA 



Seldom thalloid, generally with stem and leaves with well marked alteration 

 of generations. They contain antheridia and archegonia similar to those of the 

 ferns. The antheridia are stalked, ellipsoidal, spherical, or club-shaped; the 

 sperm cells are biciliated, the archegonia flask-shaped, the ventral portion with 

 a large center cell, the lower portion divided into an egg cell and ventral canal 

 cell. At maturity the new canal cells become mucilaginous and disorganized. 



Fig. 114. Spermogonia of Lichen, g. 

 Gonicdia, fungus threads below. sp. 

 Spermatia. Greatly magnified. After 

 Talacne. 





Fig. 115b. Lichens. 1. Ochrolechia tarlarca. 2. Rhisocarfon geographicum. 3. 

 L,ecanora subfusca, on bark of tree. 4. Caticum. .S. Bacomyces rosciis. 6. Lccanora 

 escutcnid. 7. No. 6 removed from substrntnm. 8. Craphis scrijld. 1-8 after Wettstein. 



