GUTTULINA. 



[ 367 ] 



GYRINUS. 



solid form and as cement, in mounting 

 microscopic objects in cells. See CEMENTS 

 and PREPARATION. 



GUTTULINA. See POLYMORPHINA. 



GY'GES, Bory. Described by Ehren- 

 berg as a genus of Volvocineae, having 

 neither eye-spot, tail, nor flagelliform fila- 

 ment ; the carapace (cell-membrane) simple, 

 subglobose j freshwater. 



Motion very slow. He gives two spe- 

 cies: 



G. granulum (PI. 50. fig. 14). Ovate or 

 subglobose; internal granular mass dark 

 green ; diam. 1-1150". 



G. bipartitus. Nearly spherical ; internal 

 mass yellowish green, frequently bipartite ; 

 diam.' 1-480". 



So far as appears from the descriptions 

 and figures, these do not seem to differ 

 from PROTOCOCCUS. 



(For G. sanyuinea, Shuttleworth, see 

 RED SNOW.) 



BIBL. Ehr. Infu8. p. 51. 



GYMNOAS'CUS, Bar. A very minute 

 and simple form of Ascomycetous Fungi ; 

 found on horse- and sheep's dung. (Bara- 

 netzki, Bot. Zeit. 1872; Sachs, Sot. 310; 

 Eidam, Cohris Beit. iii. 267 ; Jn. Mic. Soc. 

 1881, 489). See ASCOMYCES. 



GYMNODINTUM, Stein. A genus of 

 Cilio-flagellate Infiisori&= Peridinia with- 

 out a lorica. 



7 species ; in fresh and salt-water (Kent, 

 In/us. 442). 



G YMNOGON 'GRUS, Mart. A genus of 

 Cryptonemiaceae (Florideous Algae), with 

 horny branched fronds, the divisions cylin- 

 drical or compressed, a few inches high, of 

 a purplish-red colour. The substance of the 

 branches presents three layers of closely 

 packed filamentous cells, the central lon- 

 gitudinal, the intermediate curved, and the 

 peripherical horizontal and moniliform. 

 The spores have not been observed; the 

 tetraspores (cruciate) are arranged in mo- 

 niliform rows, in wart-like thickenings of 

 the branches. 



BIBL. Harvey, Mar. Alg. 145, pi. 18B; 

 Engl. Bot. pi. 1089 & 1926. 



GYMNOGRAMMA, Desv. A genus 

 of Grammitidese (Polypodiaceous Ferns), 

 some of the species of which are remarkable 

 for a yellow or white pulverulent appear- 

 ance on the back of the fronds, owing to 

 the presence of abundance of microscopic 

 cellular hairs, ex. gr. G. Calomelanos, G. 

 chrysophylla, ochracea, &c. Many species, 

 mostly tropical. (Hooker, Syn. Fil. 376.) 



GYMNOMIT'RIUM, Corda. A genus 

 of Jungermaunieae (Hepaticae), containing 

 one British alpine species, the Jungerman- 

 nia concinnata of the British Flora. 



BIBL. Hook. Brit. Jung. pi. 3; Ekart, 

 Syn. Jung. pi. 8. fig. 63; Engl. Bot. pi. 

 1022. 



GYM'NOPHRYS, Cienk. A genus of 

 Reticularian Rhizopoda. 



Char. Body naked, without nucleus or 

 contractile vesicles. The pseudopodial re- 

 ticulations, which exhibit the granular 

 currents, arise from a few variable points of 

 the surface. 



G. cometa. In marine and boggy pools, 

 among algae. (Cienkowski, Schnitzels Arch. 

 1876, xii. 31.) 



GYMNOSPER'MIA. A division of the 

 Flowering Plants (see VEGETABLE KING- 

 DOM), including the CONIFERS and CYCA- 

 DACE^ ; deriving this name from the mode 

 of development of the OVULES. 



GYMNOSPORAN'GIUM, B.C. A ge- 

 nus of Uredinei (Hypodermous Fungi). G. 

 juniperinum grows upon living branches 

 of the common Juniper, appearing at first 

 like an exanthema on the bark, which in wet 

 weather swells up into an orange-coloured, 

 tremelloid plicate mass, which readily dries 

 up, however, and then is scarcely visible. 

 Somewhat rare, but when present generally 

 copious. 



BIBL. Berk. Br. Fl. vi. part 2. 361 ; 

 Fries, Syst. Myc. iii. 505 ; Tulasne, Ann. 

 Sc. Nat. 4 se>. ii. 171 & 188. 



GYMNOSPO'RIUM, Corda. A genus 

 of Torulacei (Coniomycetous Fungi), cha- 

 racterized by an obscure mycelium and 

 unicellular black spores arising apparently 

 from the matrix. It is the lowest condi- 

 tion of which Torulacei are capable. 



G. arundinis occurs in this country on 

 reeds. ' 



BIBL. Corda. Anleitutig, 10 ; Berk. Outl. 

 328. 



GYMNOSTOMUM, Schwagr. A ge- 

 nus of Mosses now distributed into PY- 

 RAMIDIUM, PHYSCOMITRIUM, and other 

 genera. 



BIBL. Miiller, Syn. Muse. ; Bruch and 

 Schimper, Bryol. Eur. ; Wilson, Bryol. Br. 

 39 ; Berkeley, Handb. 237. 



GYPSI'NA, Carter. See TINOPORUS. 



G YRI'NUS, Geoflr. A genus of Coleo- 

 pterous insects, of the family Gyrinidae. 



G. natator, one of the eight British spe- 

 cies of this genus, is very commonly seen in 

 groups performing its gyrations upon the 



