GRIMMIA. 



[ 299 ] 



GUEMBELIA. 



of extremely minute filaments arising from 

 an axial filament which arises from a ramellus 

 of the involucre. Fig. 291 represents a 

 branch terminating in an involucre of whorled 

 ramelli bearing tetraspores; the lowerfigure is 



Fig. 291. 



Griffithsia spluerica. 



Fig. 291. Fragment of a frond bearing an involucre with 

 tetraspores. Magn. 20 diams. 



Detached ramellus of the involucre, showing the attach- 

 ment of the tetraspores. Magn. 40 diams. 



a portion of a ramellus, showing the mode of 

 attachment of the tetraspores. In the an- 

 theridial involucres, the plumose antheridial 

 structure is attached in exactly the same 

 way. Seven British species are recorded, of 

 which one or two are not uncommon. 



BIBL. Harvey, Brit. Mar. Alg. p. 167. 

 pi. 23 B ; Decaisne, Ann. des Sc. nat. 2 ser. 

 xvii. p. 353. pi. 16 ; Thuret, Ann. des Sc. 

 nat. 3rd ser. xvi. p. 16. pi. 5 ; Derbes and 

 Solier, ibid. xiv. p. 276. pi. 36 ; Enol. Bot. 

 pi. 1479 & 1689. 



GRIMMIA, Ehrhart. A genus of Ortho- 

 Fig. 292. 





Grimmia. 

 Teeth of peristome. Magnified 150 diameters. 



trichaceous Mosses, containing numerous 

 British species. 



Many of the species of Trichostomum of 

 Hedwig and Schwa3grichen are placed here 

 by Bruch and Schimper and C. Miiller. 



GROMIA, Duj. A genus of Infusoria. 



Char. Carapace brownish-yellow, mem- 



branous, soft, globular or oval, with a small 

 round orifice, from which very long, filiform, 

 branched expansions with very delicate ex- 

 tremities protrude. 



Dujardin places this genus in the Rhizo- 

 poda; Ehrenberg among the Foraminifera. 

 It belongs properly to the Arcellina. 



G. oviformis. Carapace globular, with a 

 short neck; marine; size 1-25 to 1-12". 

 Found among marine plants. 



G. fiuviatilis (PL 24. fig. 15). Carapace 

 globular or ovoid, without a neck ; aquatic ; 

 breadth 1-280 to 1-100". Found upon Ce- 

 ratophyllum. 



Schlumberger describes an aquatic Gromia 

 (hyalina), differing from the last in size 

 (1-860 to 1-520"), and in the carapace being 

 colourless ; hence it probably represents the 

 young state of G. fiuviatilis. 



BIBL. Dujardin, Ann. d. Sc. nat. 1835. 

 iv. In/us, p. 252 ; Schlumberger, Ann. d. Sc. 

 nat. 1845. iii. p. 255. 



GUANO. As is well known, guano is 

 imported into this country in large quantities 

 as a manure. It consists principally of the 

 excrement of birds, in a more or less decom- 

 posed state. It affords the microscopist a 

 means of procuring the foreign marine Dia- 

 tomacea3, the frustules and valves of which 

 are often contained in it in large numbers. 

 The Diatomacea3 may be obtained from 

 guano as recommended at page 202. 



GUEMBELIA, Hmp. A genus of Or- 



Fig. 293. Fig. 294. Fig. 295. 



Guembelia fontinaloides. 



Fig. 293. A fertile shoot. 



Fig. 294. Capsule with calyptra. Magn. 10 diams. 



Fig. 295. Teeth from the peristome. Magn. 150 diams. 



thotrichaceous Mosses, including various 

 species, separated from Grimmia on account 

 of the peculiar calyptra, and also the Cincli- 

 dote of P. Beauvais. 



