ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
361 
occupied by descriptions of Chara cerutophylla, jubata , contrariety stri - 
gom, polyacantha, and intermedia. The varieties and forms of each 
species, many of them new, are described in great detail, and some of 
them figured. Of C. ceratophylla 20 forms are described ; of C. contraria 
no less than 26 ; of C. intermedia 21. 
Algae. 
Stenogr amine.* — Prof. T. Johnson has investigated the structure 
and development of Stenogramme interrupta , belonging to a genus of 
uncertain position among the Florideae. The tetraspores, antherids, and 
procarps are found on distinct plants, and on both surfaces of the thallus. 
The tetraspores have a cruciate arrangement, and occur in irregularly 
placed sori* The antherids form broad flat homogeneous patches of 
polliuoids. The procarps are very numerous and of comparatively 
simple form; they occupy a unique position as part of a fertile line 
extending more or less continuously along the centre of the segments of 
the thallus. The mother-cells of the carpogenous branches constitute 
the auxiliary cells; the fertilized carpogone becomes fused by an 
ooblastema-filament with its auxiliary cell, and the resulting cell becomes 
the central cell of the developing cystocarp. The cystocarps are formed 
independently of one another, as the result of the development, sub- 
sequently to fertilization, of their own procarps. 
Callosities of Nitophyllum.f — Prof. T. Johnson describes the cal- 
losities on the tips and lateral branches of the frond of NitopJiyllum 
versicolor , which he regards as a gemmiferous state of N. Bonnemaisoni. 
These callosities consist of from twenty to thirty vertical rows of cells 
containing abundance of reserve food-material, but otherwise of the same 
structure as those of the stipe. They are apparently organs of vegeta- 
tive propagation comparable to the gemmae of the HepaticaB ; on 
germinating each callosity forms the stalk of a new plant. 
Development of Champia.}: — Mr. B. M. Davis describes the develop- 
ment of the frond of CJiampia parvula from the carpospore. Both carpo- 
spores and tetraspores were made to germinate. The apical growth of 
the frond begins, in all cases, from four cap-cells, from which arises the 
group of initial cells. The last structures to develope in the frond are 
the hyphse and the diaphragms ; the cap-cells of the segmented spore 
often divide several times before the hyphae appear. 
New Marine Chantransia.§ — Under the name Chantransia trijida 
Mr. T. H. Bull ham describes a new marine species of the genus charac- 
terized by having three filaments springing from a single basal cell. 
The mature plant is not more than from 27 to 30 p in height, and it is 
probably the smallest Floridean known. 
Chaetosphaeridium, a new Genus of Algae. || —Under the name 
Chaetosphaeridium , Dr. H. Klebahn describes a new genus of green 
freshwater Algae, with the following diagnosis Thallus microscopicus, 
* Ann. Bot., vi. (1892) pp. 361-7 (1 pi.), 
t Scient. Proc. Roy. Dublin Soc., vii. (1892) pp. 155-9 (1 pi.), 
t Ann. Bot., vi. (1892) pp. 339-54 (1 pi.). Cf. this Journal, 1889, p. 418. 
§JJouru. Quekett Micr. Club, v. (1892) pp. 24-6 (1 pi.). 
|| Jahrb. f. Wiss. Bot. (Pringsheim), xxiv. (1892) pp, 268-82 (1 pi.). 
