ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 637 



other ways than swelling. R. Van Heurclcii differs from R. parasitica 

 in having a simple basal disc of attachment, with no penetrating 

 rhizoids. Hairs sometimes occur on the thallus of mature plants, 

 arising from the lowest portion of a superficial cell. The chromato- 

 phorea resemble those of R. parasitica. The tetrasporangia are dis- 

 tributed in irregular sori over the entire surface of the plant, and are 

 accompanied by curved paraphyses. 



Reparation of Injury in Ceramiacese.* — F. Tobler describes and 

 figures the manner in which the large cells of Bornetia secundiflora and 

 Griffithsia Schousboei behave after having suffered some injury. He 

 finds that the protoplasm withdraws to the wall furthest removed from 

 the scene of the injury and clothes itself with another membrane, often 

 throwing out at the same time adventitious growths. The new cell 

 thus formed may be more or less curved and U-shaped, and it lies 

 within the torn and dead walls of the injured cell. Sometimes the 

 protoplasm divides into two portions and two distinct filaments start 

 from the same base. If a cell of Bornetia were isolated, the neighbour- 

 ing cells on either side having been injured, the protoplasm was seen to 

 divide and congregrate at both ends. It might then continue a fila- 

 mentous growth after a partition-wall had been formed between the two 

 masses of prototoplasm ; or the protoplasm might once more become 

 diffused throughout the cell, then collect in one end and, after the 

 formation of a partition-wall, grow out into a new filament. 



Trichogloea lubrica.f — F. K. Butters makes some observations on 

 this plant concerning the anatomy, the minute structure of the vege- 

 tative tract, the cytology of the vegetative tract, and the reproductive 

 organs. The author finds that while T. lubrica agrees very closely with 

 Liagora as regards the structure of the vegetative tract ; in the repro- 

 ductive tract, especially in the structure of the cystocarps, it most nearly 

 resembles Nemalion. 



New Nitophyllum.i. — A. Mazza gives a description of a species 

 of Nitophyllum, N. tristromaticum Rodrig., found by. himself at the port 

 of Messina, and previously by Rodriguez at the port of Mahon in 

 Minorca. A section of the thallus shows distinct layers of cells : 

 the cortical, composed of a single series of small, subquadratic cells ; 

 and the central layer, composed also of a single series of cells which are 

 either of the same form as the cortical ones or ellipsoidal, but twice the 

 size. The plant, 3 cm. high, arises from a very short stalk, is fan-shaped, 

 and has the upper half much divided. The margins of these divisions 

 bear many proliferations and rootlets, and the author suggests that by 

 means of these rootlets the plant can propagate itself after laceration 

 of the thallus has taken place. The rootlets are of the same colour, 

 rose-purple, as the thallus. The plant has been found no nearer the 

 surface of the sea than 60 metres. Only immature tetraspores have 

 been seen. 



Galaxaura adriatica Zan.§ — T. Bentivoglio records this alga from 

 Taranto and states that it is not so rare a plant as has been commonly 



* Ber. Deutsch. Bot. Gesell., xxi. (1903) pp. 291-300 (1 pi.). 



+ Minnesota Bot. Studies, iii. (1903) pp. 11-21 (2 pis.). 



X Nuov. Notar., xiv. (1903) pp. 106-8. § Tom. cit., pp. 109-12. 



Oct. 21st, 1908 2 T 



