246 Chlorophyceee 



marked lamellation, similar to that exhibited by Glceocapsa among 

 the Myxophycese. The cells are globose or ellipsoid, with a parietal 

 bell-shaped chloroplast furnished with one pyrenoid. 



The most abundant species is Gl. gigas (Kiitz.) Lagerh. [ = Chlorococcum 

 gigas Grun. ; Glceocystis ampla (Kiitz.) Rabenh.], which is found in stagnant 

 waters among other Algae; the cells are globose and 10 17 p. in diameter; 

 fig. 113 F H. G. vesiculosa Nag. is also a very common species of the genus 

 in which the cells are ellipsoid and 4 12 p. in diameter. Gl. infusionum 

 (Schrank) W. & G. S. West [ = Chlorococcum infusionum (Schrank) Menegh.] 

 is a large species in which the lamellation of the integument is most remark- 

 able ; diam. of cells 25 30 p. ; diam. of integuments of a single cell often 

 180 p.; fig. 113 A E. There are several other so-called 'species' of this 

 genus, but they are of doubtful value. 



The genus Capsulococcus Bennett (1888) is of very doubtful character and 

 possibly does not belong to the Algse. C. crateriformis Benn. was described 

 from the English Lake District. 



Genus Dactylothece Lagerh., 1883 1 . This genus closely 



resembles Gloeocystis in 

 the general arrangement 

 __ of the colony, but the 



Q cells are oblong-ellipsoid 



ft and division only takes 



place in one direction. 

 The chloroplast is a pari- 



Fig. 114. Dactylothece Braunii Lagerh., etal plate only occupying 

 A, from near Bradford, W. Yorks. ; B D, from i . i j i- .Li- 



near Senens, Cornwall ( x 420). about two-thirds of the 



cell and destitute of a 



pyrenoid. The lamellation of the integuments is frequently in- 

 distinct. 



D. Braunii Lagerh. occurs in damp situations and also in stagnant pools. 

 The cells are 7'5 10*5 p. in length and 3'5 4'8 p. in breadth ; fig. 114. 



Genus Palmodictyon Kiitz., 1845. The colonies of this genus 

 are very remarkable, the groups of cells and their surrounding 

 integuments being arranged in cylindrical masses, which branch 

 and anastomose with each other. The external mucous coats of 

 these elongated colonies often become very tough and assume a 

 reddish-brown colour. Reproduction occurs by the formation of 

 resting-spores or hypnospores with brown cell- walls. The germi- 



1 Lagerheim in Ofvers. af K. Sv. Vet.-Akad. Forh. 1883, no. 2, t. 1, f. 2224. 



