I I »LUN8 \M» in i;\ El . 



pda for Bohemia "C geminella Wolle Ho icspora geminella 

 Wolle Bull, of ili« Tor, Bot Club 1^77 "and describes var. minor. 

 The diameter of cells u r i\<-n for the typical C. geminella, 20 24/*, d 

 Dot agree with Wolle's figures, 16 -1 u for Hormospora, 11 16 p for 

 ( /. but arc aearer C. involute Reinsch, 23 30/l Han— 



3 var. minor is said to be 12 L5 m, diam., exceptionally 18-25 m, in 

 very young filaments 9-12 n, which would certainly include WoUe'a 

 in'th Ilu. On comparing all the descriptions ami li. can 



find no real distinction between C. involute, ('. geminella an< 

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

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



Family OEDOGONIACEAE. 



( )i.i>< \n wi Link. 



1. Oogonium with a whorl of conical projections. 3. 0. ItngBohnii. 



1. Oogonium without whorl of projections. 2. 



2. Filaments 14-20 m diam. 1. 0. PringBheimii. 



2. Filaments seldom over 12 ^ diam., usually in stellate clust 



2. I iatum. 



*1. (). Prim.mikimii Cramer ex Hirm 1900, p. 170, PI. XXVII, 

 fig. 155; Collins, L909,p.246; P. B.-A.,No. 1861. In ditch in Devon- 

 shire Marsh, April, ( !ollins. 



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

 Diocum (?), macrandrium; oogonia solitaria, globosa vd 

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

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

 plente, membrana laevi; cellula basali depresso-globosa; cellulis V( 

 tativis plus minusve distincte clavatis. 



Dioecious (?), macrandrous; oogonia single, to depn 



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

 (» »spore globose to depressed globose, filling the oogonium, membrane 

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

 distinctly clavate. 



veg. cell, female, u diam., 1-4 diam. long. 



oog. n " 20-28 it 



oosp. u " 24-26 m 



