A Synopsis of Plant Phyla 51 



sus, Chamaecyparis. (Pf. II, i, 99.) Fossil species of living 

 and extinct genera of this family are known from the later geo- 

 logical periods. 



Family 5. Thuyopsidaceae. Large evergreen trees of both 

 hemispheres, with mostly scale-like leaves ; microsporophylls with 

 3 to 5 sporangia; megasporophylls scale-shaped, woody, each 

 with one to many sporangia (seeds) ; no "seed scale.'' Callitris, 

 Liboccdrus, Thuya. (Pf. II, i, 92, and 95.) A few fossil species 

 of living and extinct genera of this family are known from the 

 later geological periods. 



Family 6. Juniperaceae. Evergreen trees or shrubs of the 

 northern hemisphere, with scale-like or spi-eading leaves ; micro- 

 sporophylls each with 4 to 8 sporangia; megasporophylls scale- 

 shaped, eventually fleshy and adherent into a berry-like strobilus, 

 each sporophyll bearing one to two seeds. Juniperus. (Pf. II, 

 I, 1 01.) Fossil species from the later geological periods have 

 been referred to this genus. 



Order Taxales. Microsporophylls in strobili but the mega- 

 sporophylls mostly single. 



Family 7. Podocarpaceae. Evergreen trees, mostly of the 

 southern hemisphere, bearing their 2-sporangiate microsporo- 

 phylls in strobili; megasporophylls in small strobili, or solitary, 

 each bearing one, usually inverted, sporangium (seed). Podo- 

 carpiis, Dacrydium. (Pf. II, i, 103.) 



Family 8. Phyllocladaceae. Evergreen trees of the southern 

 hemisphere, bearing their 2-sporangiate microsporophylls in stro- 

 bili ; megasporophylls solitary, or loosely clustered, not in strobili, 

 each circularly enclosing the single erect sporangium (seed), 

 Phyllocladus. (Pf. II, i, 108.) 



Family 9. Taxaceae. Evergreen trees or shrubs of both hem- 

 ispheres, bearing their 3- to 5-sporangiate microsporophylls in 

 strobili; megasporophylls solitary, each circularly enclosing one 

 or two erect sporangia (seeds). Cephalotaxus, Torreya, Taxi is. 

 (Pf. II, I, 107.) 



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