XVI TABtTLAR AKEANGEMENT OF NATTJHAL ORDERS. 



H. Mrtibryo solid ; no albumen. Perigone coloured, superior. 



147. Burmanniacea (p. 605). Perigone symmetrical. Stamens 3. 



148. Orchidea (p. 606). Perigone asymmetrical, f eri;ile stamen 1, gynandrous ; pollen 



in masses. 



Ckyptogaimi vasoulakes. Propagation hy simple cells (spores), impregnation hy an- 

 theridia (not by pollenj. 



149. RMzocarpeee 1^. 6ii). Sporangia included in conceptaeula. Aquatic herbs. 



150. Lycopodittcets {^. 64ii). Sporangia axillary. 



151. Equisetacea (p. 648). Sporangia at the under side of peltate scales, the latter in 



terminal cones. 



152. Filices (p. 648). Sporangia in sori at the under side of the leaves. 



