384 ALG.E CONFERVOIDE/U. [Leptomitus. 



Obscure byssoid productions, found in chemical solutions and 



various infusions. 



1. H. barytica, Ag. (barytic Hygrocrocis); tufts globose, 

 filaments very slender arachnoid hyaline densely interwoven in- 

 articulate flexuose branched, branches divaricating — Ag. Syst. 

 Alg.p. 45. Loudon, Encycl. N. 15087. 



In a solution of muriate of Barytes. 



2. H. Atramenti, Ag. (Ink Hygrocrocis); filaments dichoto- 

 mously branched minute decumbent densely interwoven in a 

 white stratum, articulations longer than broad. — Ag. Syst. Alg. 

 p. 45. — Conferva Atramenti, Lyngb. Hydroph. Dan. t. 57. 



On the surface of ink : very common. 



' 3. H. typhloderma, Ag. (skin-like Hygrocrocis); filaments 

 slightly branched densely interwoven in an olivaceous pellicle, 

 articulations as long as broad. — Ag. Syst. Alg.p. 46. — Conferva 

 typhloderma, Dillw. Conf. t. 83. 



In water containing a solution of Gum-Dragon, Mr. W. IV. Young. 



4. H. pallida, Ag. (pale Hygrocrocis); filaments dichotomous 

 curvato-flexuose fastigiate ochraceous interwoven in a gelatinous 

 coriaceous pellicle, axils rounded, articulations very long. Ag. 

 Syst. Alg. p. 46. — Conferva pallida, Dillw. Conf. t. 78. 



" My friend Mr. W. IV. Young, having let some yellow ochre remain 

 about a fortnight in a pot of isinglass size, found the surface of the ochre 

 nearly covered by the present minute and interesting Conferva." Dillw. 



5. H. Rosce, Ag. (Rose-water Hygrocrocis); filaments hyaline 

 slightly branched interwoven into a cloud-like olive-gray bul- 

 lated membrane or compact dull-gray gelatine. — Ag. Syst. Alg. 

 p. 46. 



In distilled rose-water ; Miss Trevelyan. 



6. H. sanguinea, Ag. (red Hygrocrocis); filaments branched 

 densely interwoven in a blood-red gelatinous pellicle, branches 

 divaricate, articulations rather longer than broad. — Ag. Syst. 

 Alg.p. 46 Conferva sanguinea, Dillw. Conf. Syn. p. 55. 



" Mr. Young discovered the present species, forming a densely mat- 

 ted membrane on the surface of some isinglass size, in which he had put 

 some patent yellow to dissolve; but we have since repeatedly endeavour- 

 ed to produce it in the same manner, without success." Dillw. 



7. H. Vini, Ag. (brownish-yelloio Hygrocrocis) ; brownish- 

 yellow, filaments hyaline interwoven much branched, branches 

 attenuate acute, articulations twice as long as broad. — Ag. Syst. 

 Alg.p. 47. Loudon, Encycl. N. 15093. 



In Madeira wine. 



84. Leptomitus. Ag. Leptomitus. 



Filaments hyaline, erect, parasitical, growing in fresh-water 

 or in the sea. — Name : x-Trrog, slender, and pirog, a thread. 



