18 BRITISH CHAKOPHYTA. 



St. Nectaire in France, has very small sparse spine-cells and 

 much shorter bract-cells than in the normal forms. 



Braun rejected the earlier specific name, canescens; in favour 

 of that of crinita, on the ground that the former was given under 

 a misapprehension by its author, the specimens described owing 

 their appearance to having been bleached by the sun, but this 

 objection is invalid under Art. 50 of the International Rules. 

 Loiseleur's description is admittedly an inadequate one, but we 

 do not think there is any reasonable doubt as to the identity 

 of the species intended, especially in view of the description of 

 the very characteristic armature of the stem given in 'Flore 

 Frangaise,' VI, p. 246, by De Candolle, who was evidently 

 acquainted with Loiseleur's plant. 



Monoecious species belonging to the same section are : C. 

 liirsuta Allen, from Cahfornia, and C. sihirica Migula, from 

 Tomsk Province, Siberia. 



[C. imperfecta Braun, a dioecious species with liaplo- 

 stichous cortex to the stem, the cortical-cells in non- 

 contiguous rows, and with imperfectly corticate branch- 

 lets, but closely resembling C. vulgaris in habit and 

 appearance, occurs in a very few localities in Spain, 

 France and Algiers. The gametangia at the lowest 

 branchlet-nodes are geminate or even three together.] 



Subsection 2. Diplostichee Braun, ' Consp. Char. Burop.' 

 p. 5, 1867. 

 Rows of cortical cells of the stem double the number 

 of the branchlets, a single row of secondary cells alter- 

 nating with the primary. 



1. Aulacanthsd Braun in Cohn 'Krypt Fl. Schles.' I, 

 p. 406 (1876). 

 Secondary cortical-cells larger and more prominent 

 than the primary, so that the spine-cells appear to be 

 situated in grooves. 



3. Chara vulgaris Linn. 

 (Plate XXVIII.) 



Hquisetwm olidum 0. Bauhin Phytopinax, p. 33 (1596). 



E.fostidum sub aqua repens 0. BATTHiif Prodr. Theat. Bot. p. 250 (1620). 



