206 



the appearance of being covered with pitch ; on places where it becomes 

 dry by exposure to the sun it is very friable, and on being touched 

 crumbles down to a powder." Moore, in Hass. loc. cit. 



Plate LXXXIII.fig. 5. Glfsocapsa livida, drawn from Carnuchael's 

 original specimen X 400. 



Glseocapsa caldarioxuxn. Eabh. Alg. En?: 37. 



Thallus irregular thick gelatinous, pale yellowish, cells soli- 

 tary, globose or rather elliptical, tegument spherical or elliptic, 

 colourless lamellose, lamellae often diffuse, the externally one 

 manifestly diffluent ; cell-contents homogenous, or rather 

 granulose, pale blue -green. 



SIZE. Cells -003--006 mm. with envelope -019--04 mm. 



Glceocapsa montana var. caldarii, Suringar Obs. 54, t. 4, f. 

 E. Kirch. Alg. Schles. 257. 



On walls, flower-pots, glass, &c., in conservatories and green- 

 houses. 



Plate LXX1IL fig. 6. Cells magnified 400 diam. 



G-lseocapsa polydexmatica. Kutz. Tab. 1, t. 20. 



Thallus gelatinous, more or less compact, dirty green, or olive 

 becoming brownish; cells small sphaerical, tegument very thick, 

 hyaline lamellose, lamella numerous, concentric, firm ; cell- 

 contents verdigris green, almost homogenous. 



SIZE. Cells -003--0045 mm. ; with envelope '023 mm. 

 Families '05 mm. 



Rabh. Alg. Eur. ii., 37. Kirch Alg. Schles. 257. 



Microcystis rupestris, Men eg. Nost. 72, t. 9, f. 1. 



Hcematococcus rupestris, Hass. Alg. 326, t. 82, f. 1. 



On moist rocks. 



" Frond hyaline, gelatinous, yellowish green, easily broken up, about 

 an inch in diameter, shapeless, rough, pellucid, more or less dense in the 

 centre and elevated ; when dried collapsed, blackish, cartilaginous, 

 fragile. Subjected to the microscope it appears constituted of hyaline 

 subsphaerical vesicles, enclosing yellowish green, spherical or slightly 

 oblong globules usually undivided. Solitary globules, magnified with 

 glasses less powerful are seen free and naked ; by means of a more 

 powerful microscope, almost all are perceived to be clothed with a proper 

 cyst, larger vesicles enclose smaller, and the whole frond appears areo- 

 lated, the hollow areolre containing solitary or binate globules. The 

 vesicles general as well as partial, duplex, triplex, or multiplex, and that 

 without any perceptible order, commonly present concentric circles, 

 generally approximated, evident to the light." Menegliini. 



Plate LXXX.lII.fig. 7. Cells magnified 400 diam. 



Glaeocapsa quaternata. Kutz. Tab.i., t. 20, /. 1. 



Thallus mucous, effused, dirty green, becoming reddish 

 brown; cells usually sphserical, single or twin or qtiaternate 



