T. H. BUFFHAM ON SOME FLOKIDE.E. 185 



The antheridia of Ehodymenia Palmetto, Grev. of the normal 

 character were figured (loc. cit., Fig. 15). Since then a parti- 

 cularly fine male plant was collected, and at the same station 

 another with antheridia having 3 or 4 small male proliferations 

 on each, and some elongated antheridia of clavate form pro- 

 ceeded from near the lower portions of the thallus instead of 

 forming the apices of the branches. (Hastings, Oct., 1893, 

 Mrs. T. H. B.) 



In Chylocladia oralis Hook, the antheridia form irregular 

 patches on the ultimate obovoid branchlets. Over the un- 

 changed portions of the thallus there is always a hyaline 

 coating of considerable thickness, and the male cells at the 

 border are seen to project almost through this pellucid border 

 (Fig. 9). The surface view shows the layer to be formed of a 

 congeries of rounded groups (Fig. 10). In a vertical section 

 the larger cells near the cortex are found to bud into smaller 

 ones which put forth cells about 25 fx high that emit the polli- 

 noids. These are about 4 jj. in diam., and they and the 

 elongated cells are loosely placed in the gelatinous invest- 

 ment just mentioned (Fig. 11). (Torquay, August, 1894.) 



Ptilothamtiion Pluma Thur. (Callitham?iion Pluma Ag.) 

 is a very minute plant, sometimes only 2 mm. high, growing 

 on the stipes of Laminaria. It was separated from Callitham- 

 nion by Thuret on account of the difference of the procarp 

 and fruit. The male organs are terminal on the branches, and 

 consist of a short jointed axis surrounded by a gelatinous 

 layer containing the pollinoids. The antheridia are 50 — 70 //, 

 long, and 35 /x in diam. These bodies are drawn by Bornet in 

 Notes Algologiques, PI. 46. (Swanage, June, 1892. Also found 

 by Mr. E. A. Batters at the same station, August, 1891.) 



Compsothamnion gracillimum Schmitz (Callitliamnion gracil- 

 limum Ag.) is an exceedingly beautiful alga which has been 

 only recently removed from Callith amnion, and the antheridia 

 are very different from those of the latter genus. In a male 

 plant they are produced on a pedicel of one to several cells, a 

 pedicel arising from almost every cell of a branchlet. In some 

 cases there are several antheridia in a group (Fig. 12). Even 

 with a low power the appearance is rather striking, for minute 

 dots arranged transversely are seen along the antheridium 

 giving a glistening appearance to the specimen. The repro- 



