KEY TO THE PHYLA 329 
2. Cellular filamentous hysterophytic plants, 
often much degenerated, without chloro- 
phyll; heterogamic. 
Phylum 7. CARPOMYCETEAE. 
II. Plants of ine obvious, alternating generations, typ- 
ically terrestrial. 
a. Gametophyte generation larger, and longer-lived 
than the dependent sporophyte generation. 
1. Gametophytes from prostrate and thalloid to 
erect leafy shoots; sporophytes globose to 
cylindrical or stalked, neither expanded nor 
rooted. 
Phylum 8. BryopHyta. 
b. Gametophyte generation smaller and _ shorter- 
lived than the independent sporophyte 
generation. 
1. Both generations mostly holophytic, independ- 
ent of one another. 
(a) Gametophytes typically flat and thal- 
loid, normally attached by rhizoids, 
mostly monoecious; sporophytes consist- 
ing of large-leaved, solid stems, which 
are rooted below. 
Phylum 9. PreRipoPpHyYTa. 
(b) Gametophytes typically flat and thal- 
loid, normally attached by rhizoids, 
mostly monoecious; sporophytes con- 
sisting of mostly solid, cylindrical, 
jointed and fluted stems, bearing small, 
whorled leaves at the nodes, and rooted 
below. Phylum 10. CaLAMOPHYTA. 
(c) Gametophytes typically tubular or glo- 
bose, with few rhizoids or none, often 
dioecious; sporophytes consisting of 
solid, cylindrical, continuous (not joint- 
ed) and not fluted stems, bearing small 
spirally arranged (or opposite) leaves, 
and rooted below. 
Phylum 11. Leprpopnyta. 
2. Gametophytes hysterophytic, dependent upon 
and nourished by the sporophyte. 
