THE ALGAE OF BERMUDA. 39 



is probably not uncommon, but is easily overlooked, as it can be found 

 only by microscopic examination. It has been found in small quan- 

 tity in Halymenia bermudensis, Grasmere, March, Hervey. 



ENDODERMA Lagerheim. 



1. Cells mostly irregular. 1. E. viride. 



1. Cells mostly cylindrical. 2. E. filiforme. 



1. E. VIRIDE (Reinke) Lagerheim, 1883, p. 74; Collins, 1909, p. 279; 

 P. B.-A., No. 2006; Entocladia viridis Reinke, 1879, p. 476, PI. VI, 

 In the cell wall of various algae, common. 



2. E. filiforme sp. nov. Filamentis lateraliter vel dichotome 

 ramosis, cellulis vegetativis cylindricis, prope apices circa 2 /j. diam., 

 longitucline diametrum pluries superante; inferne ad 6 M diam., longi- 

 tudine diametrum duplo superante, forma plus minusve irregulari; 

 quavis cellula matura in sporangium mutata, circumscriptione cir- 

 culari supra visa, 6-12 fj. diam., depresso-hemisphaerica lateraliter 

 visa, membrana crassa; prolongatione papilliformi per membranam 

 plantae hopsitis protrusa, mox aperta ad exitum sporarum (?); sporis 

 (?) 2 /j. diam., in cellula paucis; setis, cellulae continuis, haud raro 

 membranam hospitis penetrantibus, basi circa 4 fj, diam., mox ad 2 /z 

 attenuatis, neque bulbosis nee constrictis; chromatophora parietali, 

 pyrenoideo unico, magno, munita. 



Filaments branched laterally or dichotomously; vegetative cells 

 cylindrical, near apex about 2 p diam. and several diam. long, below 

 up to 6 IJL diam. and 2 diam long, more or less irregular; any cell of the 

 older portion changing to a sporangium, circular in outline seen from 

 above, 6-12 ^u diam., depressed hemispherical in side view, with 

 thick wall; a small papilla-like extension passing through the wall of 

 the host, then opening to permit the exit of the spores (?); spores 

 about 2/x diam., few in a cell; bristles continuous with the cell also 

 occasionally passing through the wall of the host, the base about 4 /j. 

 diam., quickly tapering to 2 n, no constriction or bulb. In wall of 

 Lyngbya con/ervoides, Bailey's Bay, Jan. 18, 1913, Hervey. Type in 

 Collins herbarium, No. 7419a. 



The older part is not unlike E. viridis, but the long, very slender, 

 often quite straight filiform branches distinguish it from that as well 

 as from other species; these branches seem usually to run lengthwise 

 of the host, dividing mostly dichotomously; the older cells increase 

 rapidly in width, and send off many branches at right angles, often 



