Ser. GONGYLOSPERME/E. ( 21 ) Fam. RHODYMEXIACE/E. 



Plate LXXIII. 

 STENOGRAMME INTEBEUPTA.— J/on?'. 



Gen. Char. — Frond flat, nerveless, cellular ; central cells large, transparent, and colour- 

 less, those near the sui-face small, coloured. Fructification : 1. "Linear, convex, 

 nei-velike conceptacles, containing a dense mass of minute spores" {Harvey), 

 2. Tetraspores, unknown. Name from o-rei'by, "naiTOw," and 7pa;u^r;, "aline;" 

 alluding to the linear fructification. 



Stenogkamme interrupta. — Mont, in Ducliart. Rev. Bot. 1846, p. 483; llarv. 

 P. B. plate 157 ; Harv. Man. p. 124 ; Harv. Syn. p. 103 ; Atlas, 

 plate 36, fig. 167 ; Harv. N. B. A. part 2, p. 163 ; /. G. Agardh, Sp. 

 Gen. Alg. vol. ii. p. 391. 



Stenogramme Ewopea. — Harv. in. Herb. 1847. 



Delesseria interrupta. — Ag. Sp. Alg. vol. i. p. 170 ; Ag. Sysf. p. 250; Mont. 

 in Webb, Ot. Hisp. p. 15, t. 8 ; Endl. 3rd Suppl. p. 53. 



Hab. — Among rejectamenta. November. Very rare. Bovisand, near Plymouth (i)r, 

 J. Cocks) ; Mt. Edgecombe {Rev. W. S. Hore). 



Geogr, Dist. — Cadiz ; Cabrera ; Plymouth Harbour ? 



Desciiiption. — Root, a small flat conical disc. Frond flat, mem- 

 branaceous. Stem short, tlai'ee to six lines long, suddenly exjjanding 

 into a roimdisli frond, three to five inches in height ; four to five times 

 divided in a more or less regidarly dichotomous manner, into narrow 

 seo'ments, which are linear, erect, but with rounded axils, and obtuse 

 rounded apices ; width nearly uniform in the same sj^ecimen, but varying 

 in different specimens from three to six lines. In some specimens the divi- 

 sions extend almost to the base, while in others the lower third or nearly 

 one-half is quite entire, while the rest is divided into narrow lacinise. 

 Sometimes one or all of the segments have been accidentally torn ofT, 

 and one or more proliferous elongations arise from the summit, which 

 become dichotomous like the rest. "The margin, which is usually quite 

 flat and very entire, sometimes throws out minute, lobed, and somewhat 

 fringed processes." — Harvey. Fructification, consisting of hnear con- 

 ceptacles occupying the centre of the frond in the manner of a midi-ib, 

 but never continuous, being always interrupted about the axils, com- 

 mencing opposite, a little below or in the lower parts of the frond, a 

 little above the axil, and, proceeding along the middle of the frond, 

 terminates about a quarter of an inch below the fork or axil imme- 



