APPENDIX. 



Character of Frond. Minute tufts rising from a tubercle; parasitic on Asperococcus 

 cchinatus. Threads {filaments) very slender; curved; simple; not tapering to 

 either end; jointed. 



Measurement. About ^ an inch long. 



Fructification. Minute seeds {spores) concealed in the substance of the tubercle. 

 Habitat. Filey Bridge. Parasitic on Chorda Lomentaria and Functaria plantaginea. 

 The Eev. F. W. Ilayden, 1862. 



Those sufficiently interested in the Elacliistas to examine them microscopically 

 will be glad to be told further that the tubercle, whence their tufts arise, is in 

 all cases composed of branching threads, so closely packed together as to form 

 a compact mass. And among these branching threads nestle the s]9ores, which 

 in F. Haydeni are at the lower end of the threads, narrow oval in shape (narrow 

 oh-ovate, i. e. the reversed egg-shape — the small end upwards), and have an 

 abrupt cut-off appearance at top. 



ELACHISTA? CAMBRIElSrSIS? 



Colour. Dark olive. 

 Suhstance. Soft. 



Character of Frond. Minute tufts (rising from a globose tubercle) ; parasitic on the 

 stems of Arthrocladia villosa. Threads {filaments) within the tubercle, 

 simple; tapering to the base; swollen to the circumference; then very long, 

 tapering gradually from the circumference of the tubercle, to their extremity. 

 Joints {articulations) of the threads {filaments) broader than long at the 

 circumference; lengthening as they become narrower. 



Measurement. Varying from -^-^ to -J- of an inch. 



Fructification. Minute seeds {spores) growing on some of the threads of the tubercle. 

 Habitat. Only one known yet. Llanbedrog and Pwllheli, North Wales. 



This plant is remarkably beautiful under the microscope when fresh, in con- 

 sequence of its stellate appearance; when re-moistened the long threads 

 become somewhat flabby and confused. I give it its name provisionally, until 

 a scientific one has been awarded to it. Dr. Gray thought it had the characters 

 of Professor Agardh's F. steUaris, but Agardh himself finds points of difference, 

 and the matter will probably never be settled till some one else finds the 

 plant, and probably on other F%ici. I found it in September, 1868, on Arfhro' 

 cladia villosa, which was thrown up in quantities with Fctocarpus Uttoralis on 

 the shore at Llanbedrog. Margaret Gatty. 



Family YI. ECTOCARPACE^. 



ectooaepus tesselatus. 



Tliis plant having been alluded to under fig. 95 as raised to the dignity of a 

 species, it is necessary to add here that Dr. Harvey does not allow its claims to 

 any other position than that of a varied form of F. granulosus (fig. 95); a 

 species very irregular in its habit of growth. Sometimes it is alternately branched 

 throughout, as appears to have been the case in the plant from which the figure in 

 English Botany was taken, or it is alternately branched in the larger divisions, 

 and exactly oppositely in the lesser ones, as figured in the Fhycologia Fritannica; 

 or the last branchlets are secimd, i. e. set along one side of the penultimate ones, 



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