Tyndaridea.] hL&M CONFERVOIDEiE. 361 



69. Tyndaridea. i JBory. Tyndaridea. 



Filaments simple, finally inosculating by transverse tubes. 

 Endochrome consisting of two subrotund masses (stelhe), which, 

 after conjugation, unite and form a roundish globule (sporidiumj, 

 lodged either in one of the articulations, or in the connecting 

 tube. — Name : Tyndaridce ; the constellations so called of 

 Castor and Pollux, incorrectly spelled " Tendaridca" by Bory 

 in Diet. Class. oV Hist. Nat. 



1. T. crucidta, Harv. (cross-like Tyndaridea); stellse round 

 ish, sporidia subglobose lodged in one of the filaments. — Zyg- 

 nema cruciatum, Z. gracile and decussatum, Ag. Syst. Alg. p. 77 

 — 78. — Conferva bipimctata, Dillw. Conf. f. 2, and C. decussata, 

 Syn. Conf. p. 51. 



In ditches and pools, common. — This forms extensive masses, of a 

 yellowish-green colour, finally rising to the surface. Articulations 

 marked by two roundish dots, which, after conjugation, unite to form a 

 globular sporidium in one of the filaments. 



2. T. epigcea, Harv. (ground Tyndaridea); " filaments inter- 

 woven into a crisped stratum, articulations once and a half as 

 long as broad, granular mass dense scarcely bipartite, sporidia 

 globose lodged in one of the filaments." Cann — Zygncitta epi- 

 gceum, Carm. JISS. 



On road-sides and frequented paths; Spring to Autumn, Capt. Car- 

 michacl. — " Filaments an inch or more in length, as thick as those ofjT. 

 crttciata, spreading, to an indefinite extent, in a thin intricate yellowish 

 fleece over the dry naked earth; here and there grouped and curled in 

 a most characteristic manner. Articulations 1 — 3 times longer than 

 broad, and remarkably opaque ; internal mass partially separating into 

 two square smooth portions. Sporidia sphaerical, lodged in one ot the 

 filaments." Carat. MSS. 



3. T.pectindta, Harv. MSS. (comb-like Tyndaridea); stellse 

 transversely linear pectinate, globules contained in the swollen 

 transverse tubes. — Zygnerna pectinatum, Ay. Syst. Alg.p* 78. — 

 Conferva bipunctata, E, BoU t. 1610, (not t. 2463,/ B.).— C. 

 tripartita, 11 Bot. t. -2-W-2 ? 



In stagnant water, common. — "This, like Z. crueiatum, occurs in 

 larL'c yellow i>h Boating iiiiisms. They are often found intermixed, nor 

 is there any thing to distinguish them from each other, in tluir usual 

 state, but the transversely oblong shape of the internal dots; which 



results probably from the shortness of tin- articulations. In a stale <>t 

 junction, however, tin- position of the sporidia leaves uo doubt that the\ 

 are distinct species.* 1 Carm, MSS. 



-1. T.bicolor, Harv. MSS. (variegated Tyndaridea); mtaneoti 

 simple slender straight bright-green, joints thrice a- long as 

 broad vrhite-edged even mi eraJ of them together here and there 

 empty white and pellucid, — Conferva tricolor, /.'. H<>t. t 2288. 



<>n stones, in a rapid streamlet at Henfield, Sussex, .1/ • B '■>"•. 



i lii the Synopsis of the General thjs in inaceuratelj ipelled Tentaridea, ami 

 the character ii different from the amended one here given. W, II Harvey. 



