2GG T. II. BUFF HAM ON REPRODUCTIVE ORGANS OF THE FLORIDE^C. 



It may not be out of place here to state that in two species of 

 the last-named genus the tetraspores are further divided so that 

 each sporangium appears to have sixteen (instead of the four usual) 

 spores or sporules. 



L. ovalis Endl. was collected by my friend, Mr. W, H. Gilburt. 

 at Teignmouth, in Aug., 1881 ; L. refiexa Chauv. by myself at 

 Sidmouth, Aug., 1886. 



DESCRIPTION OF PLATES XX., XXL, XXII. 



PLATE XX. 



Fig. 1. — Helminthora divaricata J. Ag. Corymbose branch bearing 



antheridia, x 25. 

 ,, 2. — Tip of the same showing antherozoids, X 400. 

 „ 3. — Callithamnion brachiatum Bonnem. Optical section of an anthe- 



ridium, X 400. 

 „ 4. — Ceramium tenuissimum J. Ag. An antheridium on inner side of 



node, X 200. 

 „ 5. — Spyridia Jilameidosa Harv. Two secondary branchlets bearing 



antheridia, X 25. 

 ,, 6.— Ditto. Antheridium, X 200. 



PLATE XXL 



,, 7. — Delesseria Hypoglossum Latnour. Part of plant with antheridia. 



n. s. 

 ,, 8. — Ditto. Portion of a frondlet. Antheridia in lines, X 25. 

 „ 9. — Ditto. Edge of a promontory of the same projecting on to the 



coloured surface of frond, X 400. 

 „ ^10- — Catenella Opuntia Grev. Small portion of frond with groups of 



antheridia, X 25. 

 „ 11. — Ditto. An antheridium, X 100. 



12. — Lomentaria refiexa Chauv. Filament bearing antheridia, X 25. 



13. — Ditto. Surface of antheridia, X 200. 



14. — Ditto. Profile of antheridial layer, X 400. 



PLATE XXII. 



15. — Chondriopsis tenuissima Ag. A ramnle bearing a group of 



antheridia, X 25. 

 L6. — Ditto. Side view of antheridium, X 100. 

 J 7. — Bhodomela subfusca, Ag. Tuft of antheridia, X 10. 

 18. — Ditto. Terminal portion of antheridium, X 100. 

 19, — Daaya coccinea Ag. Monosiphonous filament invested with an 



antheridium, X 100. 

 20. — Ditto. Transverse section of antheridium, x 200. 

 21. — Boatrychia gcorpioideg Mont. Apex of filament developed into 



an antheridium, X 50. 



