GLCEONEMA. 



[ 293 ] 



GNETACEiE. 



ish, soft, but tubercular; cell- contents seru- 

 ginous; 1-700'". H. lividus, Has?i. 



7. G. Magma. Stratum purplisli-black, 

 crustaceous, granular; cell-contents 1-500'" 

 to 1-320'". Sorospora montana, Hass. 



8. G. sanguinea. Stratum black ; internal 

 cells deep blood-red; cell-contents 1-600 to 

 1-400"'. = Bamatococcus sanguineus, Ag,, 

 Hass. 



9. G. Shuttleworthiana. Stratum dirty 

 red ; internal cells orange ; cell-contents 

 1-1000 to 1-900'". 



10. G. RaJfsiana. Stratum dirty purple ; 

 internal cells rosy - purple ; cell-contents 

 1-750 to 1-400'".= Sorospora Ralfsii, Hass. 



In PI. 3. fig. 13 is represented a form we 

 have met with among freshwater Algse, 

 which appears to agree with Kiitzmg's G. 

 ampla. 



Those resting forms of Euglena where the 

 encysted groups are devoid of a firm outer 

 coat, bear considerable resemblance to a 

 large Gloeocapsa. 



BiBL. Kiitzing, Phyc. generalis, p. 173, 

 Sp. Alg. 216, Tab. Phyc. pis. 19 et seq.; 

 Hassall, Brit. Freshwater Algce, pi. 79, &c. 



GLCEONEMA, Ag. 1 —Names of Diato- 



GLOIONEMA, Ag. J maceous genera no 

 longer retained. See Encyonema. 



GLCEOSPORIUM, Montague.— A genus 

 of Sphffironemei (Coniomycetous Fungi) de- 

 veloped beneath the surface of leaves, and 

 bursting through, forming a kind of rust on 

 the surface. 



1. G, paradoxum (Myxosporium para- 

 doxum, De Notar.) occurs on ivy. 



2. G. Labes. Asteroma labes, Berk. 

 Brit. Fungi. 



3. G. concentricum {Cylindrosporum con- 

 centricum, Grev. Sc. Crypt. Flor. pi. 27) 

 forms a white rust upon cabbage-leaves. 



BiBL. Berk. & Br. Ann. Nat. Hist. 2 ser. 

 v. p. 455 ; Berkeley, Hart. Trans, vi. p. 121. 



GLOIOSIPHONIA, Carm.— A genus of 

 Cryptonemiacese (Florideous Algae), the sin- 

 gle British representative of which is a rare, 

 feathery, red sea- weed, 3-12 inches high, 

 with a semi-gelatinous tubular frond. The 

 spores are in dense masses, scattered among 

 the radiating jointed filaments which clothe 

 the periphery of the branches. 



BiBL. Harvey, Brit. Mar. Alg. p. 152. 

 pi. 21 A, Eng.Bot.iA. 1219. 



GLYCERINE— Is the sweet principle of 

 thefats. It may be prepared by boiling any fat, 

 as tallow, butter, olive oil, &c., with oxide of 

 lead and water, the water being from time to 

 time removed, and replaced by fresh. The 



aqueous solutions are freed from the lead by 

 sulphm'etted hydrogen, the filtered Hquid 

 evaporated to the consistence of a syrup, 

 and finally in vacuo over sulphuric acid. 



Glycerine, when pure, is a colourless, 

 highly refractive, syrupy liquid, of a sweet 

 taste ; it mixes in all proportions with alco- 

 hol and water, but it is insoluble in aether. 

 The property possessed by glycerine of con- 

 stituting a liquid which does not become dry, 

 and mixes with water, has caused it to be 

 used for the preservation of microscopic ob- 

 jects, especially those which will not permit 

 of being dried. It renders objects as trans- 

 parent as Canada balsam. 



We prefer solution of chloride of calcium 

 for all preparations except those of insects ; 

 as the larvae, &c. and starch. 



GLYCIPHAGUS, Hering.— A subgenus 

 of Acarus. 



We omitted in the art. Acarus to add 

 the heads under which certain s})ecies of 

 Acarus, Latr. are noticed. Thus, Acarus 

 scabiei = Sarcoptes scabiei ; Acarus equi = 

 Psoroptes eq.; Ac.folliculorum-=Demodex 

 foil 



GLYPHOMITRIUM, Bridel.— A genus 

 of Orthotrichaceous Mosses, deriving its 

 name from the grooved calyptra. Glypho- 



Fig. 287. 



Glyphomitrium Daviesii. 

 Teeth of the peristome. Magnified 150 diams. 



mitrium Daviesii, Brid. is found in Wales 

 and Ireland on rocks, mostly near the sea. 

 It is peculiar to Great Britain and Ireland. 



GNAT. See Culex and Culicid^. 



GNETACEiE.— A family of Gymnosper- 

 mous Flowering Plants remarkable for their 

 jointed stems, composed of wood marked 

 with circular disks. (See Wood.) The 

 flowers of these plants are also very remark- 

 able, the male consisting merely of a calyx 

 containing one-celled anthers united by their 

 filaments; the female, of a naked ovule with 

 two involucral scales, originally with two 

 coats, but subsequently with a third which 



