140 GIGARTINA. 



among the filaments of the periphery. Name, from y 

 a grapestone, which the tubercles resemble. G. pislillata is 

 not unlike the stalk of a bunch of raisins, from which the 

 fruit has been removed, leaving the pedicels only. 



1. G. pistillata, Gmel. ; frond compressed, stipitate, fla- 

 bellately branched ; branches repeatedly forked, with wide, 

 rounded axils, naked or pinnated with short, horizontal, 

 subulate ramuli, which bear the tubercles at or near their 

 tips. Grev. Alg. Brit. p. 146 ; Hook. Br. Fl. ii. p. 300. 

 Harv. Phyc. Brit. t. ccxxxii. Fucus gigartinus, E. Bot. 

 t. 908. 



On rocks, near low-water mark ; very rare. Perennial. Spring. Coast 

 of Cornwall, in several places. Jersey. Root an expanded disk. Fronds 

 several from the same base, 3 6 inches long, compressed or subcylindri- 

 cal, from half a line to a line in diameter, tapering at base, rising with a 

 simple stem for an inch or two, then once or twice forked, the segments 

 elongatad and again repeatedly forked towards the extremities ; the apices 

 acute, and branches erect, the upper branches, in fruit-bearing specimens, 

 pinnated with short, horizontal, simple or forked, or sometimes with pin- 

 nated ramuli, from 2 lines to an inch long. Tubercles seated on the 

 sides or terminating the ramuli, spherical, depressed in the centre, of the 

 colour of the frond, with a thick opaque coating, containing a mass com- 

 posed of several distinct clusters of very minute spores. Substance cartila- 

 ginous when recent, horny when dry. Colour a dull purple, becoming 

 darker in drying. The Irish station noticed in ' Mag. Nat. Hist.' vol. ix. 

 p. 148, is incorrect. 



2. G. acicularis, Wulf. ; frond cylindrical, filiform, irregu- 

 larly branched, between pinnated and dichotomous ; branches 

 divaricating, curved ; ramuli few, scattered, very patent, 

 subulate, often secund ; tubercles spherical, scattered on the 

 branches. Grev. Alg. Brit. p. 147, t. 16 ; Hook. Br. Fl. ii. 

 p. 300 ; Wyatt, Alg. Damn. No. 26 ; Harv. Phyc. Brit. t. 

 civ. Fucus acicularis > E. Bot. t. 2190. 



On rocks, near low-water mark ; rare. Annual ? Winter. Several 

 places on the coasts of Devon and Cornwall. At Torquay, in December, 

 with tubercles very fine, Mrs. Griffiths. Belfast Bay, Mr. Templeton, 

 (Turner). Fronds tufted, 2 4 inches high, with a simple or forked, 

 arched or wavy stem, set with patent or horizontal, alternate or secund 

 branches of about equal length, and which are either naked or furnished 

 with a second or third series; branches cylindrical, about half a line in 

 diameter, acuminate ; ramuli subulate, pinnate or secund, of unequal 

 length. Tubercles spherical, sessile on the smaller branches, or occasion- 

 ally terminating the ramuli, scattered or clustered. Substance cartilagi- 

 nous. Colour a dull purple-red, darker when dry. 



3. G. Teedii, Turn. ; frond membranaceous, flaccid (horny 

 when dry), flat, linear, acuminate, repeatedly pinnated with 

 slender, horizontal, distichous, subulate ramuli ; capsules 



