BOTANY. 
371 
bj Dr. Taylor, very similar to P. MacJcaii, but with the leaves to- 
wards the perianth tipped with a minute apiculus. 
955. *P. microscypha, Tayl. l.c. — Found with Parmelia leuco- 
mela. 
This probably exists only in Dr. Taylor’s Herbarium. It would 
appear to be very near to the preceding. 
956. *P. rotalis, Tayl. l.c.— Dr. Hooker, Capt. Iiaughton, 
Melliss, Seemann. 
A small, pale-brown species, with its perianth tumid, obtuse, 
without apiculus, and with or without a trace of a fold on the upper 
side. 
Lejeunia, Gottsche et Lindenb. 
957. *L. pterota, Tayl. Lond. Journ. of Bot. 1S45, p. 91 ; L. 
adscensionis, ejusd. l.c. — Hab. also Ascension, Dr. Hooker. 
After a comparison of the specimens, there seems to be no distinc- 
tion between them, except that the specimen marked L. adscensionis 
is entirely barren. 
Minute scraps of several other species of this great genus have 
been observed amongst the St. Helena specimens. 
Plate 56, f. d. 1, plant of the natural size; 2, portion of stem, 
with leaves and stipules; 3, perianth, as seen from the under side; 
4, transverse section of same about its middle : all magnified. 
Pallavicinius, Gray Nat. Hist. Brit. Plants, i. p. 684 ; Steetzia, 
Lelim. Gottsche, Lindenb. etNees Syn. Hepat. p. 785 ; Diplo- 
laena, Dumort. Syll. p. 82. 
958. *P. proeumbens, Tayl. Lond. Journ. of Bot. 1845, p. 93. — 
Dr. Hooker, Capt. Haughton, Melliss. 
All the specimens of this species are alike in their brown colour, 
and although similar to the European P. Lyellii, appear to differ in 
the indistinct nerve. 
Plagiocliasma, Lehm. et Lindenb. in Lehm. Pugil. 
pi. iv. p. 13. 
959. *P. limbatum, Tayl. Lond. Journ. Bot. 1845, p. 95. — 
Capt. Haughton; Ascension, Dr. Hooker. 
b b 2 
