APPENDIX. 
Fructification. Minute seeds (spores) concealed in tlie substance of the frond. 
Habitat. Cumbrae in the Clyde. Growing on Chondreas C7nspus. April, May, and June, 1853. 
Mr. Eoger Kennedy. 
General observers may always know this plant from Leathesia tuber if ormis (fig. 54) by its 
decidedly solid substance. A touch ascertains this at once. And its tuher-\\ke character 
sufficiently distinguishes it from L. Berkeleyi (fig. 5fi). The more advanced student, who 
is disposed to make durch schnitts of the two tuberous forms, will observe that the threads 
which compose the outer -coat {periphery) of L. tuberif ormis are short and straight; whereas 
those of L. crispa are very distinctly curled, and are rather longer: nor are they as re- 
gularly and roundly bead-like in the latter as in the former. Very little difference is 
observable in the spores (which are borne among these outer-coat filaments at the base). 
For scientific description and figure see Natural History Review, 1857, “ Proceedings of 
Societies,” p. 201. 
ELACHISTA GREVILLEI. 
Colour, Olive, tending to brown. 
Substance. Somewhat rigid. 
Character of Frond. A small tuft (rising from a small tubercle) ; parasitic on Cladophora 
impestris. Threads (filaments) slender ; simple ; tapering to the base ; scarcely to the 
tips ; jointed. 
Measurement. From J, inch to J long. 
Fructification. Not ascertained. 
Habitat. Largs : Dr. Greville, July 1852. Corrighills, Arran : Professor Walker Arnott, 
the same year. 
This little plant is described as “ simffiir in many respects to Elachista fucicoJa (fig. 61), 
but smaller, with shorter joints and arising from a much smaller tubercle. Kemarkable too 
for growing on one of the chlorosperm algae, whose fronds it often infests as densely as C. 
fucicola does those of the Fuci.” For scientific description and figure see Natural History 
, Review, 1857, “ Proceedings of Societies,” p. 201. 
ELACHISTA HAYDENl. 
Colour. Olive, tending to dark brown. 
Substance. Soft. 
Character of Frond. Minute tufts rising from a tubercle; parasitic on Asperococcus echinatus. 
Threads very slender; curved; simple; not tapering to either end; jointed. 
Measm^ement. About ^ an inch long. 
Fructification. Minute seeds (spores) concealed in the substance of the tubercle. 
Habitat. Filey Bridge. Parasitic on Chorda Lomentaria and Punctaria plantaginea. The 
Rev. F. W. Hayden, 1862. 
Those sufficiently interested in the Elachistas 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 spores, which in E. Hay deni are at the lower end of the threads, 
narrow oval in shape (narrow o5-oya^e, be. the reversed egg-shape — the small end upwards), 
and have an abrupt cut-off appearance at top. 
162 
