DISCOPLEA. 



[ 267 ] 



DISTIOIIIUM. 



DISCOPLE'A, Ehr.— A genus of Diato- 

 macoa\ not now retained, the species being 

 refenvdto tlie genera Ct/clofc/laiind Coacino- 

 rf/mw. Ehr. Jier. Ber'l. Ak. 1844, p. 197. 



prSCORBT'NA, Parker and Jones.— One 

 of the Rofcdinco, having a turbiuoid spire, 

 ■with vesicuhir chambers, opening one into 

 anotlier by slit-like apertures, which are 

 usually tented over by a succession of um- 

 bilical Haps, forming a star-like ornament 

 (see AsTKRiGERiN.vK The shell is usually 

 coarsely, sometimes finely, and occasionally 

 partially porous. Fossil and recent. D. 

 rosacea\V\. :34. fig. 7 a, b) is a neat variety 

 of D. turbo. 



BiBL. Carpenter, Introd. Foram. 203. 

 DISOO'SIA, Libert.— A genus of Sphre- 

 ronomei (Stylosporous Fungi), probably re- 

 lated to some of the Spha-rice, as stylospo- 

 rous forms. The species have been described 

 under various names ; and the genus Ph/i/c- 

 tid'mm of Notaris is synonymous with it. 

 The British species recorded seem to have 

 been greatly confused by ditlerent writers ; 

 for Discosia alnea, Libert, found on the 

 leaves of alder and beech, = »S';j/w^/-/« arfo- 

 creas, Tode. Xi/hima f(igineum,Ve\'$., Vhlijc- 

 tidium nitidinn, Wallr., Ph. clypoatum, No- 

 taris, and, from its name, we conclude also 

 Dothidea alnea, Pers. of Hook. Brit Flor., 

 with its synonyms. Fries, in his Smnma 

 Veget., gives D. artocreas, alnea, and chj- 

 peata as three distinct species. 



BiBi.. Leveille, Ann. Sc. Nat. .3 ser. v. 

 286 ; Fries, Sum. Veget. 423 ; Fresenius, 

 Beitr. z. Mycol. Heft i. 66, pi. 8 ; De No- 

 taris, Mem. Accad. Torino, 1849, 2 ser. x. ; 

 Berk., Hooh. Br. Fl. 278, 288. 



DLSCOSIRA, Ptab.— A genus of Diato- 

 macese. 



Char. Frustules disk-shaped, concate- 

 nate ; valves nearly plane, with curved 

 costfe ; margin denticulate ; centre deli- 

 cately punctate. 

 D. sulcata. Italy. 



BiBL. Rabenhorst, Flor. Alg. i. p. 36. 

 DISEL'MIS, Duj. = Chl.vimidomoxas, 

 Ehr. {Chi. pidvisculus, Tj. = Disebnis viridi.f, 

 D. ; PI. 7. fig. 2b,c.; PL 30. group -30). 

 See Protococcus. 



Dnjardin describes a marine species, D. 

 marina. Body almost globular, obtuse and 

 rounded in front, gi-anidar within, and (from 

 generic characters) with a non-contractile 

 tegument and two similar cilia. 



He adds to this genus D. Di/nalii=3Io- 

 nas Dunalii, Joly, giving rise to the red 

 colour of the reservoirs of the salt-works of 



the Mediterranean ; oval or oblong, often 

 constricted in the middle ; colourless when 

 young, greenish when older, red when 

 adult ; no eye-spot. 



Probably marine Algas. 

 BiBL. i)ujardin, Inf. 340; Joly, Hist, 

 d'un Petit Crust ace ^-c'. 1840. 



DISIPHO'NIA, Ehr.— Z>. amtralis (PI. 

 51. fig. \iS)=. Diato7neUa, pt, 



DISO'MA, Ehr. — A genus of Infusoria, 

 of the family Enchelia. 



Char. Body double, not ciliated : mouth 

 without teeth, ciliated and truncated ( = En- 

 cheli/s with a double body). 



J), vacillans (PI. 30. fig. 45). Segments 

 clavate, filiform ; hvaline and narrowed at 

 the anterior end; lengtb 1-380 to 1-288", 

 In the Red Sea. 



BiBL. Ehr. Infus. .302. 

 DIS'SODON, Grev. and Arnott.— A ge- 

 nus of Splachnaceas (Acrocarpous o])ercu- 

 late Mosses), including some Splachna of 

 authors and a Cyrtodon. 



BiBL. Wilson, Bry. Brit. 295 ; Berkeley, 

 liandh. 163. 



DISTEM'MA, Ehr.— A genus of Rota- 

 toria, of the family Hydatintea. 



Char. Eves two, cervical ; foot forked. 

 D.forfcida (PI. 43. fig. 25; fig. 26, teeth). 

 Body cylindiico-conical ; eyes red ; toes 

 strong, recurved, toothed at the base; fr. 

 water; length 1-120". 



Three other species, two of which are 

 freshwater, and one marine. In the latter, 

 D. marina, the cervical eye-spots are co- 

 lourless; if these do not really represent 

 eyes, this species must be referred to the 

 genus Pleurotrocha. 



BiBL. Ehr. Infvs. p. 449. 

 DIST10HIA'CE..E.— Afamilyofopercu- 

 late Acrocarpous (terminal-fruited) Mosses, 

 of Cfespitose habit ; the stem increasing to- 

 wards the point, simjjle or branched ; the 

 leaves with a dorsal keel-like nerve, equi- 

 tant-concave, densely imbricatively overlap- 

 ping, parencbymatously areolated. Cells mi- 

 nute, with thick walls, somewhat papillose, 

 very densely packed, squarish. Capsules 

 oval, equal. British genus : 



DISTIC'HIUxM, Br. and Schimper.-Ca- 

 lyptra dimidiate. Capsule annulate. Peri- 

 stome simple, with sixteen equidistant teeth, 

 free at the base, once or several times slit 

 from the base to the apex, trabeculate, deep 

 purple, homogeneous, smooth or rough. In- 

 florescence monoecious. 



BiBL. Wilson. Bry. Brit. p. 104 ; Berke- 

 ley, Handb. p. 266. 



