78 ACOTYLEDONS. — ALGiE. OscUlatoria. 



Very lubricous, but var\'ing excessively in the size and colour of the 

 vvliorled hranchlefs. Most frequently purple, sometimes dark or 

 blue green, or even blue. The Conf. nigra of D'dlw. and E. B. is 

 now, I believe, generally acknowledged to be only a state of this 

 on which the hranchlefs have been destroyed. 



7. GLOIONEMA. 



Filaments gelatinous, continuous, with very obscure joints, with- 

 in filled with elliptical spora?)gia. 



\. G\.J'(vlidu7n, filaments connpressed branched flaccid and ge- 

 latinous coadunate free at their extremities, branches crowded 

 subdichocouious, dissepiments obsolete, articulations rather 

 long [D7U1V.) including a solitary elliptical granule. Dillw. 

 Cotij: f. 104, and E. B.t.2\0\ '{Conferva foe li da). 



Hab.. Rocks on the coast of Morayshire, Mr.Borrer and Hook. 



Tills is a singular production, and from its smell one v/ould suspect it 

 to be animal matter. I have never been able to distinguish the ar- 

 ticulations Mr. Dillwyn mentions, but have found the ovate or el- 

 liptical brown Ijodies in the pellucid membranous filaments to as- 

 sume a beaded appearance. 



8. SCYTONEMA. 



Filaments continuous, subcoriaceous (not gelatinous), having in- 

 ternally transverse annuliform parallel sporangia. 



1. S. atro-vire/is, tufts brov/nish black, filaments olivaceous 

 brown rigid branched, branches slender, rings dotted with gra- 

 nules. yitT. p. 115. Conferva atrn-virejis, Dillio. i. 25. 

 Lichen exilis, Ligtilf. p. 894. Collema pannosuviy Ach. 

 Syn. Lic/i. p. 329. 



H.\B. Naked rocks in the Highlands, especially such as are moistened 

 by the spra)- of cataracts, Lighif. 



Forming dense blackish tufts, v/ich sliortish capillary branched fila- 

 ments. It seems doubtful whether this should be arranged with 

 the Lichens or Confervcc. External swellings (tubercles or apothe- 

 cia ?) have been observed upon them ; but vvhether actual fructifi- 

 cation or not, future observations must determine. Agardh in 

 eludes in the present genus, besides the plant in question. Con- 

 ferva comoifles, radicans, Mijoclirous and ucelluta of Dltlw., 

 which certainly have a habit in common, 



9. OSCILLATORIA. 

 F/Va^/^f??/ J continuous, membranaceous, gelatinous, filled inter- 

 nally with transverse parallel annuliform sporangia. — ^The 

 Oscillatorice are divided into two kinds by Agardh. The Os- 

 cilL vera" are those vvhich are collected into a gelatinous stra- 

 tum, shining and blackish green above, after being dried par- 

 taking of a beautiful leruginose tint. Their filaments have 

 been thought to have a voluntary movement ; they elongate 

 and increase rapidly, are always simple, though Agardh has 



