10 



Subfam. 3. Bangieae. 

 Bangiopsis Schniitz. 



1. Bangiopsis subsimplex (Mont.) Schmitz. 



SCHMITZ in Engler und Prantl, Natiirl. Pflanzenfam., 1. Teil, 2. Abt., 

 p. 314. 



Compsopogon subsimplex Montagne in Annales scienc. nat., Bot., Ill 6 ser., 

 t. 14, 1850, p. 299. 



When young the plant is filamentous composed of a single 

 row of cells. These in the young filaments are disc-shaped 



(Fig. 5 c), their length 

 being much shorter than 

 the breadth, often only 

 a fourth in the newly 

 divided cells. They are 

 divided by horizontal 

 walls and all cells are 

 capable of division. The 

 diameter of the fila- 

 ments is about 35 /*. 

 The base of the plant 

 consists of an enlarge- 

 ment of the lowermost 

 end of the basal cell, 

 forming in this way a 

 small disc by means of 

 which the plant is faste- 

 ned to the substratum 

 (Fig. 5 h). I have not 

 seen any rhizoids grow- 

 ing out from the lower- 

 most cells as is the case 

 in Bangia. 



In the somewhat 

 older filaments the cells 

 now and then begin to 

 be divided also by 

 longitudinal or more or 

 less oblique walls. This 



Fig. 5. Bangiopsis subsimplex (Mont.) Schmitz. 



a, part of a filament which begin to be rami- 

 fied, b, part of a ramified thallus. c, filament 

 composed of a single row of cells showing 

 cell-division, in the upper end one cell divided 

 by an oblique wall, d, e, f, g, transverse sec- 

 tions of filaments consisting of a single to 

 many cells, h, base of a plant, (a and b 

 about 150 : 1, ch, 200 : 1). 



division of the cells is 



rather irregular; in some plants nearly the whole filaments are 

 divided, in other we find parts of the filaments divided into many 



