36 COLLINS AND HERVEY. 



records for Bohemia "C. geminella Wolle (Hormospora geminella 

 Wolle Bull, of the Tor. Bot. Club 1877) " and describes var. minor. 

 The diameter of cells given for the typical C. geminella, 20-24 n, does 

 not agree with Wolle's figures, 16-21 y. for Hormospora, 14-16 (JL for 

 Cylindrocapsa, but are nearer C. invohda Reinsch, 23-30 /x. Hans- 

 girg's var. minor is said to be 12-15 p., diam., exceptionally 18-25 n, in 

 very young filaments 9-12 n, which would certainly include Wolle's 

 C. geminella. On comparing all the descriptions and figures, we can 

 find no real distinction between C. involuia, C. geminella and C. 

 geminella var. minor; and in the Bermuda material we can match 

 practically every figure. We have therefore used the oldest name. 



FAMILY OEDOGOXIACEAE. 

 OEDOGONIUM Link. 



1. Oogonium with a whorl of conical projections. 3. O. Itzigsohnii. 



1. Oogonium without whorl of projections. 2. 



2. Filaments 14-20 M diam. 1. O. Pringsheimii. 



2. Filaments seldom over 12 n diam., usually in stellate clusters. 



2. O. consociatum. 



*1. O. PRINGSHEIMII Cramer ex Him, 1900, p. 170, PI. XXVII, 

 fig. 155; Collins, 1909, p. 246; P. B.-A., No. 1861. In ditch in Devon- 

 shire Marsh, April, Collins. 



*2. O. consociatum sp. nov. Plate I, figs. 1-4; P. B.-A., No. 

 2068. Diocum (?), macrandrium; oogonia solitaria, globosa vel 

 depresso-globosa, operculata, rima mediana vel subsuperiore, angusta 

 sed distincta; oospora globosa vel depresso-globosa, oogonium im- 

 plente, membrana laevi; cellula basali depresso-globosa; cellulis vege- 

 tativis plus minusve distincte clavatis. 



Dioecious (?), macrandrous; oogonia single, globose to depressed- 

 globose, operculate, division median to superior, narrow but distinct; 

 oospore globose to depressed globose, filling the oogonium, membrane 

 smooth; basal cell depressed-globose; vegetative cells more or less 

 distinctly clavate. 



veg. cell, female, 6-12 (20) /j. diam., 1-4 diam. long, 



oog. 28 M " 26-28 M 



oosp. 26 M " 24-26^ " 





