Revisions of Some Plant Phyla 3 



b. Gametophyte generation smaller and shorter-lived than the inde- 

 pendent sporophyte generation. 



1. Both generations mostly holophytic, independent of one 



another. 



(a) Gametophytes typically flat and thalloid, normally at- 



tached by rhizoids, mostly monoecious; sporophytes 

 consisting of large-leaved, solid stems, which are rooted 

 below. 



Phylum 9. Pteridophyta. 



(b) Gametophytes typically flat and thalloid, normally at- 



tached by rhizoids, mostly monoecious ; sporophytes 

 consisting 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 globose, with few 



rhizoids or none, often dioecious ; sporophytes consist- 

 ing of solid, cylindrical, continuous (not jointed) and 

 not fluted stems, bearing small spirally arranged (or 

 opposite) leaves, and rooted below. 



Phylum II. Lepidophyta. 



2. Gametophytes hysterophytic, dependent upon and nourished 



by the sporophyte. 



(a) Sporophj^lls open, ovules and seeds naked (gymnosperm- 



ous). 



(i) Gametophytes dioecious; sperms ciliated and motile; 

 sporophytes producing microspores and megaspores 

 in spiral or whorled sporophylls, or these aggre- 

 gated into cones. Phylum 12. Cycadophyta. 



(2) Gametophytes dioecious; sperms not ciliated, not 

 motile; sporophytes with sporophylls in cones. 



Phylum 13. Strobilophyta. 



(b) Sporophylls closed, ovules and seeds covered (angio- 



spermous). 

 (i) Gametophytes dioecious; sperms not ciliated, not 

 motile; sporophytes with sporophylls in flowers. 



Phylum 14. Anthophyta. 



In this paper only the 4th, 6th, 7th, 12th and 14th phyla stand 

 sufificiently in need of revision to warrant rewriting in this article. 

 As in the original the figures in parentheses refer to volume, 

 parts and pages of Engler and Prantl's " Natiirlichen Pflanzen- 

 familien." In a few cases the citation is to Engler's " Syllabus," 

 seventh edition. 



39 



