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. 



^•r^ 



Fig. 114. Spermogonia of I/ichen. g, 

 Goniodia, fungus threads below. sp, 

 Spermatia. Greatly magnified. After 

 Tulacne. 



F]g. 115b. I^ichens. 1. Ochrolechia fartarea. 2. Rhisocarpon geograpktcum 3 

 Lecanora suhfusca, on bark of tree. 4. Calicum. 5. Bacomvces roseus. 6. Lecanora 

 esculenta. 7. No. 6 removed from substratum. 8. Graphis scripta, 1-8 after Wettstein. 



