T. H. BUFFHAM ON REPRODUCTIVE ORGANS OF THE FLORIDE.E. 265 



Much more difficult to detect, as a rule, are the delicate and 

 evanescent trichogynes of the Floridece, but students who desire to 

 understand the reproductive processes will wish to see them, and I 

 may mention that, besides those of Calliihamnion tetricum Ag., 

 described and figured formerly, I have observed the following, 

 most of them with antherozoids attached : — 



Spermothamnion rep ens (Callithamnion repens Lyngb.). 



Sp. Turneri Aresch. {Call. Turneri Ag.) 



Spondylothamnion multifidum Nag. (Wrangelia midtifida J. Ag.) 



Hehninthora divaricata J. Ag. (Dudresnaia divaricata J. Ag.) 



Calliihamnion brachiatum Bonnem. 



Dudresnaya coccinea Crouan. 



Gl&osiphonia capillaris Carm. 



Spyridia filamentosa Harv. 



Plocamium coccineum Lyngb. 



Chondriopsis dasyphylla Ag. (Laurencia dasyphylla Grev.) 



Ch. tenuissima Ag. (L. tenuissima Grev.) 



Polysiphonia fibrata Harv. 



P. affinis Moore. 



P. byssoides Grev. 



P. fruticidosa Spreng. (Rytiphlcea fruticulosa Harv.) 



Bostrychia scorpioides Mont. (Helicothamnion scorpioides Kiitz.) 



In Dudresnaya the mode of fecundation is extremely curious 

 and interesting : tubes go from the trichophoric apparatus to a 

 procarp, and this in turn sends out another tube to another 

 procarp, and so on until several are fertilized in turn. In Spyridia 

 I have found two trichogynes on each of several procarps. 



Mention has several times been made of instances, though 

 unusual, where two kinds of the reproductive organs have been 

 seen on the same plant. In Seirospora Griffithsiana Harv. that 

 author describes the fruit as tetraspores "in beaded dichotomous 

 strings." Now these bodies are not tetraspores, and are never 

 divided, but he may, nevertheless, have seen tetraspores, for they 

 are sometimes found, isolated, and some distance below the 

 seirospores, the inference only (that all were tetraspores) being 

 wrong. Such examples I took at Weymouth, Sept., 1882, and 

 Aug., 1885. Spyridia filamentosa Harv. bearing both cystocarps 

 and tetraspores was gathered at Sidmouth, Aug., 1886. On 

 Lomentaria Tcaliformis Gaill. the same association was found at 

 the same time and station. 



