374 
ST. HELENA. 
generally in the Island, but principally on the outskirts. Also found 
in Great Britain. 
Usnea, Hffm. 
974. XT. barbata, Fr. ; forma florida, Fr. — A greenish-white 
Lichen, covering the stems and branches of trees on the windward 
side of the Island on the high land, especially the Gumwood-trees 
atLongwood, from the branches of which it hangs down like beards, 
two or three feet in length ; and also from the .Fir-trees in exposed 
and windy places, as at West Lodge, Thompson’s Wood, Rockrose 
Hill, Mount Pleasant, &c. It sometimes forms quite a thick coat 
on the exposed or windward side of the tree, while the other side of 
the stem is almost devoid of lichen. It is generally more or less 
damp and moist even in dry weather. Alt. 4. It is also found 
in Great Britain. Sterile. 
97 A TJ. barbata, Fr. ; forma hirta, Fr. — A species similar to the 
other, but much coarser in texture ; found in the same situations — 
viz., on the high land, where the atmosphere is moist ; found also 
in Great Britain. Sterile. 
976. XT. barbata, Fr forma ceratina, Schter. — A more twiggy 
and wire-like species ; found also in Great Britain. Fertile. 
977. XJ. barbata, Fr. ; forma articulata, Acli. — A species found 
also in Great Britain. 
978. XJ. laevis, (Eschw.) — Sterile. 
Ramalina, Ach. 
979. R. seopulorum, Acli.- — One of the shrubby, brittle, brown- 
ish-white Lichens, found on rocks on the barren outskirts of the 
Island ; a very twiggy, branching species, about two or three inches 
in height. Found also in Great Britain. 
980. R. angulosa, Laur. — This species, and the three following, 
were gathered by l)r. Burchell at Longwood in the years 1809 
and 1815. 
981. R. angulosa, Laur. ; forma gradient a. — Fertile. 
982. R. angulosa, Laur. ; forma humilis dilatata, — From rocks 
close to Round Tower, Ladder Hill. Fertile. 
9S3. R. pollinaria, Ach. — Found on the Gumwood-trees at 
Longwood. H. L. Alt. 4. Sterile. 
984. R. polyinorpha, Ach. — One of the shrubby, pale greenish- 
