ACOTYLEDONS. — ALG/E. Batrackospermum. 77 



purple or green. They propagate by various means, either hy 

 granules, which fall out on the bursting of the filaments, or, 

 after the union of two filaments by the granules of ttvo arti- 

 culations collecting into une ; or, by an articulation giving 

 origin to a neiu individual, and, as it were, viviparoiis ; or, 

 ly seeds included in a capsule or immersed in gelatine. 



5. DRAPARNALDIA. 

 Pro72£Z gelatinous. Primary filaments jo'mted, with penicellate 

 branchlets. Granules internal. — Fronds very gelatinous, and 

 formed of conferva-like^/ame7i/5 of two kinds, of which one 

 is penicelliform, and, as it were, parasitic on the other more 

 simple one. The primary filaments are equal, jointed ; the 

 articulations pellucid, marked with a green transverse zone. 

 Secondary filaments in pencil-shaped fascicles, with short ar- 

 ticulations scarcely distinct, terminated by a long, acuminated, 

 pellucid point. Fruit ; none external, but the species are pro- 

 pagated by granules included in the articulations. They have 

 a most elegant appearance on paper, resembling a beautiful 

 drawing, and adhere firmly by their own tenacity. 



1. D. glomerata, pencils of branchlets ovate obtuse patent, ^g. 

 p. 124. BatrachospermiL7n glomeratum, Vauch. Conf. t. 12. 

 f. 1. Conferva mutabilis, E. B. t. 1746. 



Hab. Margins of lakes, clear ditches, and streamlets, attached to 



stones and aquatic plants. 

 Very gelatinous ; in tufts of 2 or 3 inches in length. Primary branches 



pellucid, rather thick ; secondary ones small, much pencilled, with 



the branchlets spreading, in which respect it differs principally from 



the following. 



2. D. plumosa, pencils of the branchlets lanceolate acute erect. 

 Ag.p. 124. Batrachospermum plumoium, ranch. Conf. i. 11. 



f. 2. Conjerva mutabilis, Dillw, Conf t. 12. 

 Hab, Tlie same situations as the last. 



6. BATRACHOSPERMUM. 



jp;-onc? gelatinous. Primary filaments jointed, branchlets ver- 

 ticillate. Gemmce external. Fronds very gelatinous, branch- 

 ed, often moniliform, composed oi filaments of two kinds. The 

 primary ones resembling the more simple ConfervcB, jointed, 

 equal ; and filaments or branchlets arising from their joints, 

 whorled, divided, moniliform. Fruit; gemmce P or seeds, 

 external among the branchlets. 



1. B. moniliforme, frond alternately branched moniliform, 

 branches attenuated. Ag. p. 122. Batrachospermum moni- 

 liforme, Fauch. Conf L I./.5. t. 11./. 1 and 3. E. B. 

 t. 689. Dillw. Conf t. 32. 



Hab. Clear running .streams,, not uncommon. 



