Sek. GONGYLOSrKRME^. (181) Fam. CERAMIAOEvE. 



CALLITHAININION AFFmE.—IIan\ 



Gkn. Chak. — Fronds filiform and articulated, sometimes at length in the older parts 

 cellular and partially opaque, single-tubed ; divisions mostly pinnate, dissepiments 

 hyaline. Fructification of two kinds, on distinct plants : 1. Favellas, mostly 

 lateral on the branches, and filled with minute spores ; 2. Tetraspores, external, 

 triiiartite or cruciate. Name from Ka\hs, "beautiful," and Bd/Mvos, "a shrub." 



Callithamxion ajine. — " Much branched and bushy, the stem rather 

 opaque, full of veins ; secondaiy branches long, having a roundish out- 

 line, alternately plumulate ; plumules very narrow, simply pinnate ; 

 pinnse short, erect, increasing in length upwards, alternate, crowded at 

 top ; articulations of the branches three or foiu- times, of the pinnae 

 once and a-half as long as broad ; tetraspores generally solitary, rising 

 from the basal cells of the pinnre." — Ph/c. -Brit. 



Callithamnion affine. — Harv. in Hooh. Br. Fl. vol. ii. p. 344 ; Harv. P. B. 

 plate 331 ; Harv. Man. p. 180 ; Harv. Syn. p. 152 ; Atlas, plate 59, 

 fig. 273. 



Hab. — Parasitical on i^MCt, between tide-marks. Annual. Summer. Shores of ' Bute 

 {Dr. GreviUe). 



Geogr. Dist. ? 



Description. — Fronds much tufted, two to three inches high, rather 

 slender, and tapering upwards ; main stem mostly percurrent, opaque at 

 the base, with veins, transparent and free from veins towards the summit, 

 much branched from the base ; branches again once or twice divided, 

 and regulaidy bi-tripinnated, the pinnae long, slender, and suberect, 

 pinnules short, subulate, rather longer upwards, very erect, and gradually 

 tapering to a fine point, scarcely incurved ; occasionally some of the 

 pinnules become elongated, and again pinnated. Articulations of the 

 main branches three or four times as long as broad ; those of the pin- 

 nules about once and a-half Substance soft and delicate, adhering 

 closely to paper. Colour, a fine clear deep lake. Tetraspores " globose, 

 mostly solitaiy, at or near the base of the pinnules." Favellae " in pairs, 

 on slightly distorted branches, each favella occupying the place of a 

 suppressed ramulus." — Ph^c. Brit. 



This is at least a very doubtful species, and although, when we com- 

 pare it with normal forms of its allies, it certainly appears sufficiently 



