1412 Journal of Applied Microscopy 



Richards, H. M. Ceramothamnion codii, a Recent collections of Codiicm tomoi- 

 new Rhodophyceous alea. Bull, Torrey, ^ i ■ ti i i_ tvj^ h- l 



Bot. Club. 28: 257-265^ pis. 21-22, 1901. f'''"»' "^^de in Bermuda by Mr. Rich- 

 ards reveal an addition to our list of 

 Rhodophyccie. The form discovered is epiphytic on Codiiim, scarcely visible 

 to the naked eye, appearing only as a slight reddening on the host plant. The 

 new plant seems to combine in itself the characters of four other algae. In 

 habit it is like Rhodochorton, a prostrate filament sending up erect filaments 

 and sending down rhizoids into the host. In structure it resembles Callitham- 

 nio/i, and Ccramiian, having monosiphorous internodal cells and a node of three 

 or four rows of closely packed smaller cells. Alternate nodal and internodal 

 cells are cut off by the apical cell of each filament ; the nodal cell divides longi- 

 tudinally and transversely to form the rows ; the internodal cell merely enlarges 

 in all directions. Elongated hairs may arise from the nodal cells. 



Reproduction is by tetraspores and polyspores. The tetrasporangium arises 

 from an upper cell in a young node, often enclosed later by a bract-like growth 

 of other adjoining nodal cells. After the maturity and discharge of the cruciate 

 spores, proliferation of the basal cell of the sporangium occurs and another 

 tetrasporangium is formed within the old wall. Mr. Richards reports finding 

 sometimes four or five older walls surrounding a developing sporangium. The 

 antheridia also arise from nodal cells, which by their activity, spreading up and 

 down, completely envelop the internode. Usually the antheridial plants are 

 separate. The polyspores resemble quite strongly the favellae of CaUithamnioti, 

 but entirely lack the functioning trichogyne. They occur in the axils of special 

 branches near the tip. After careful investigation the author is emphatic in 

 declaring that polysporic development is purely asexual and that where a hair is 

 present, it in no way acts as a trichogyne. 



For the reason that this alga resembles Rodochortoti in habit, CanUhamnion 

 in cell and chromatophore structure, Ceramiiim in filamentous form, Ptilota in 

 polyspores and has besides proliferation of the sporangium, the author makes it 

 a new genus, Ccramothamuion. The paper is accompanied by two plates. 

 Chicago. Philip G. Wrightson. 



Chamberlain, Charles J., A. M., Ph. D. In- The series of articles which appeared 



structor in Botany in the University of under the above title in The JOURNAL 

 Chicago. Methods in Plant Histology. . ,, , , 



Price ^i qo *^^^ APPLIED MICROSCOPY has been 



thoroughly revised and enlarged by 

 about one-third and is now published in book form by the University of 

 Chicago Press. Directions are given for collecting and preparing plant mate 

 rial of all groups for microscopic investigation. The various processes of fixing, 

 embedding, sectioning, staining and mounting are treated in detail. In the 

 later chapters specific directions are given for making those mounts which are 

 needed by classes studying the development of the plant kingdom. It is 

 intended to meet the requirements not only of the student who has the assist- 

 ance of an instructor in a well equipped laboratory, but also of the student who 

 must work by himself and with limited apparatus. Formulae are given for 

 stains and other reagents. 



