^L4 SUMMARY OF CURRENT RESEARCHES RELATING TO 



prefer cold and rapid water and are commonly found in mountainous 

 regions, such as C'eratoneis Arcus and Odontidium hyemale. The author 

 closes his paper with an observation of biological interest regarding the 

 algae of this Canal du Midi. He finds that since the augmentation of 

 traffic, and consequent necessity for frequent opening of the locks, the 

 development of the algal flora has diminished, and many species have 

 disappeared. This is, he considers, owing to the want of stagnant water 

 in which certain diatoms, desmids and other algse, find their most 

 favourable habitat. 



Laminaria bullata.* — Olga Mueller has made a study of the vege- 

 tative thallus, and gives the results under three sections : External 

 Morphology, Anatomy, and Haptere. The material examined was 

 collected at Port Renfrew, B.C., and was found growing attached to 

 rocks where the tidal currents were very strong. They grew in the 

 sublittoral zone, and could only be collected at low tide and with diffi- 

 culty. The plant is a perennial. It consists of three tissues, the 

 epidermal, the cortical, and the pith. Only the first two are found in 

 the hapteres, while the stipe and lamina contain them all. Figures are 

 given of the structure of various parts of the plant. 



Demonstration of Masked Chlorophyll in Laminaria. — T. Ber- 

 wick publishes a revised note on Laminaria, in which he details several 

 experiments which serve for showing masked chlorophyll in that genus, 

 and are useful for class purposes. The first experiment is described as 

 follows : — If a frond of Laminaria of any length — the longer the better 

 — after being simply air-dried, be passed with moderate rapidity with 

 both hands through an ordinary bat-wing, or Bunsen flame, at once the 

 brown colouring matter (phycophasin) disappears, the discharge of a 

 misty vapour accompanying the change. 



Endocladia muricata.J — F. M. Warner publishes some remarks on 

 this alga, and describes both its external habit and structure. He agrees 

 with Setchell and Gardner as to the internal identity of E. muricata 

 with E. hamulosa. The plants of E. muricata were found growing on 

 rocks and boulders in the upper portion of the littoral zone very near 

 high-water mark. A plate shows good figures of the structure. 



Floride8e.§ — G-. B. De Toni has published the final section of his 

 " Sylloge Floridearum," being part of his " Sylloge Algarum." The 

 present section contains Grloisiphoniaceas, Grateloupiacese, Dumontiaceae, 

 Nemastomaceaj, Rhizophyllidaceae, Squamariaceaa, and Corallinacese ; as 

 well as the index to the whole of the Floridea3. Finally, the author gives 

 in an appendix the names of all genera and species published since the 

 appearance of the earlier sections, thus bringing the treatment of 

 Florideae up to date. Except in the case of new genera and a few 

 species, the names in the appendix stand with their references only, 

 and sometimes their habitat, without diagnoses. 



* Minnesota Bot. Stud. ser. iii. (1901) pp. 303-8 (1 pi.). 



t Trans. Proc. Bot. Soc. Edinburgh, xxii. (1904) pp. 395-G. 



% Minnesota Bot. Stud., ser. iii. (1903) pp. 297-302. 



§ Sylloge Algarum, iv. Florideae, sect. 4 (1905) pp. 1523-1973. 



