80 ACOTYLEDONS. — ALGM. Confevva, 



(Granules disposed in spiral lines.) 



1 . Z. vitidiim, articulations about as long as they are broad, 

 spiral lines crossing each other slender crowded^ mass of gra- 

 nules at length elliptical. Jg. p. 98. Covferva nit'ida, E. B. 

 t. 2337. D'dliv. Covf. t. 4. f. C. Conjugata princeps, 

 Vauch. 



Hab. In stagnant waters, occasionally, Hopk. 



FiUiments thicker than in the rest of the genus, forming large dark 

 green patches. 



2. Z. qnimmim^ filaments equal, spiral lines simple rather lax, 

 articulations longer than their diameter, mass of granules at 

 length elliptical. Ag. p. 100. Covferva spiralis, E. B. 

 t. f656. Dilliv. Co?if: t.3. 



Hab. a frequent inhabitant of ditches and ponds, Hopk. In a burn 

 on the summit of Ben Nevis, Mr. Turner and Hook. 



3. Z. infiatum, filaments here and there inflated, spiral lines 

 simple lax, mass of granules at length elliptical. Ag. p. 101. 

 Conferva itiflata, E. B. t. 2376. 



Hab. Ditches and bogs, frequent, Hopk. 

 Articulations twice or thrice as long as they are broad. 



II. IIYDRODICTYON. 



Filamevts united in a reticulated manner. Articulations vivi- 

 parous. Frond utriculate, composed o{ Jilaments united in 

 such a manner as to form a beautiful net-work. From each 

 articulation (forming one side of the, mostly, pentangular 

 areolae) a new individual is produced, according to Vauchcr, 

 entirely resembling the parent plant. 



1. H. tilrici/latum. Ag. p. 97. Conferva reticulata, Linn, 

 E. B. t. 1687. Dillw. Covf t. 97. 



IIab. Ditches and pools ? 



I think, but am not sure, I have heard this has been found in Scotland. 

 It is one of the most singular of all the Alg(r, and resembles, when 

 floating upon water, a fine and beautiful tubular net. 



12. CONFERVA. 



Filaments jointed, uniform, bearing excessively minute seeds or 

 sporules internally. — Thejilainents are all uniform, simple or 

 branched, green or coloured, jointed. The articulations filled 

 with a mass of sporules, including frequently scattered granules. 

 The joints are formed by an aimular constriction, where the 

 filaments are easily broken. There is no external fructifica- 

 tion; but the gran7iles frequently vegetate within the filaments, 

 as has been seen to be the case in Conf rivularis, facta, &;c. 



* Coloured, brunclied, not aquatic. 



1. C. Orthotrici, filaments very short olivaceous brown branched 



