26 Brannon . — The Structure and Development of 
Schmitz, Fr. Untersuchungen liber die Befruchtung der Florideen. Sitzungs- 
berichte der kon. Akademie der Wissenschaften zu Berlin, p. 220. 1883. 
Davis, B. M. Development of the Frond of Champia parvula, Harv. from the 
Carpospore. Ann. of Bot., Vol. vi, 24. Dec. ’92. 
Kuckuck, Paul. Review of Oltmann’s Ueber die Kultur- und Lebensbeding- 
ungen der Meeresalgen, Bot. Centralblatt, 51, 204-207. 1892. 
Johnson, T. The Procarpium and Fruit in Gracilaria confervoides, Grev. Ann. 
Bot., Vol. i, Nos. Ill and IV. 
On Sphaerococcus coronopifolius, Stackh. Ann. Bot., Vol. ii. 
Osterhout, W. J. V. A simple freezing Device. Bot. Gazette, XXI, 195-201. 
Apr., 1896. 
EXPLANATION OF FIGURES IN PLATES I-IV. 
Illustrating Mr. Brannon’s paper on Grinnellia americana , Harv. 
Fig. 1. Transverse section of a frond, m, showing the region of the midrib. 
the region of the frond which is only one layer of cells in thickness, x 125. 
Fig. 2. Transverse section of the holdfast, c, thick, yellowish cuticle, co, the 
cortical portion of the holdfast, r , one of the rhizoidal filaments, x 725. 
Fig. 3. c, cystocarps borne on the distal end of the proliferations, x 30. 
Fig. 4. Two carpospores two days old showing a thick, cellulose cell- wall. 
a, spherical spore before germination, and h , the spore having become elliptical 
in outline shortly after the formation of an apical cell, x 500. 
Fig. 5. Three germinating carpospores showing gelatinous coats of cellulose 
arranged concentrically, b, two -celled stage of germination, c and d, more 
advanced and showing apical growth, x 500. 
Fig. 6. Carpospore four days old. b, a, a 1 are the cells which are to produce 
the foliar portion, and b 1 the cell which is to develop the holdfast portion of the 
plant, x 500. 
Fig. 7. A tetraspore eight days after beginning to germinate, h , a filamentous 
holdfast, c, the longitudinally arranged chromatophores, and v, the vacuoles. 
X500. 
Fig. 8. Transverse section of a cluster of antheridia. d, a mother-spermatium- 
cell with the protoplasm collected in its distal end. d L , showing the separation 
of the young antherozoid. c , more advanced, and c l a young antherozoid with 
shining granular contents completely separated from mother-cell. (Haematoxylin 
preparation.) x 1 200. 
Fig. 9. Surface-view of a patch of young antheridia ( an ). x 325. 
Fig. 10. Portion of the marginal region of a young female frond showing 
a three-celled cystocarp which is developing apically from a modified vegetative 
cell, x 220. 
Figs. 11 and 12 show more advanced stages of Fig. 10. x 220. 
