English: Plate 1.
Figs. 1, 2. Boodlea composita, f. Fig. 1, a small portion of a thallus to show its characteristics in the plane phase, x 15. Fig. 2, tip of a branchlet showing a hapteral cell attaching to a larger segment, x 73. Ecuador.
Figs. 3-6. Derbesia longifructa. Four oval-oblong sporangia attached to the supporting filaments, showing the basal septum or, in fig. 3, a definite stalk cell. Ecuador, x 115.
Figs. 7-9. Derbesia Hollenbergii. Portions of three filaments to show young subturbinate sporangia, and an old sporangium with an evident stalk cell. I. Santa Maria, x 70.
Figs. 10-13. Codium isabelae. Four peripheral utricles, each showing a much-thickened end wall and one or two gametangia. I. Isabela. x 70.
Figs. 14-16. Codium santamariae. Three peripheral utricles with slightly thickened end walls and solitaria gametangia. I. Santa Maria, x 70. [= syn. of Codium isabelae, AlgaeBase]
Figs. 17-18. Acetabularia parvula v. americana. Fig. 17, one segment of a disk and portions of others, to show the unarmed end wall, x 90. Fig. 18, insert, two coronal processes to show the hair scars, x 140. Is. Revilla Gigedo. [= syn. of Parvocaulis parvulus, AlgaeBase]