Refugium Botanicum. | (June, L869. 
TAB. 96. 
Tribe MALaxIDE&. 
Genus PievroTHALuis, A. Br. 
P. prnamELLAtA, Rchb.f. inv. Schlechtendal, Linnea, xxii. p. 830. Dense 
cespitosa, caule secundario trigono, demum quinque-sulcato, folio 
cuneato ligulato-lineari lanceo dorso infra nervum medium ob- 
tusangulo transsectione subtrigono, valde crasso, apice angustissime 
tridentato, dentibus lateralibus nunc obliteratis, floribus aggregatis 
paucis, ovario subpapuloso, sepalo summo oblongo-lanceo, seu ovato- 
ligulato obtuso seu apiculato, limbo nunc ciliatulo papuloso, sepalis 
lateralibus connatis cuneato transverso-oblongis seu subquadratis 
apice minute bifidis, supra nervos medios extus carinatis, tepalis 
oblongo rhombeis antice denticulatis, labello a basi subcordata seu 
humerato dilatato trifido, laciniis lateralibus rhombeis extrorsis, 
lacinia antica porrecta cuneato-oblonga obtuse-acuta, carinis geminis 
oblique elevatis semiovatis seu semiquadratis integris seu lobulatis, 
seu crenulatis a regione antebasilari in discum anticum seu medium, 
columna trigona, dorso carinata, androclinii hmbo membranaceo 
denticulato imtegro seu trifido, lacinia postica retuso lobulata, 
laciniis lateralibus semiovatis acutis.— Pleurothallis bilamellata, 
Rehb. f. Lindl. Folia, 1. Pleurothallis, No. 58! BP. obscura, Rich. 
Gal. Orch. Mex. p. 17! Lindl. loc. c. sub P. angustifolia, No. 89! 
We obtained the living plant from gardens at Berlin, Ham- 
burgh, London, Reigate, out of the Botanic Gardens, the col- 
lections of Messrs. Schiller, J. Day, W. Wilson Saunders. But 
among all the numerous Mexican collections we have obtained or 
had lent, the plant has only occurred once. Mirador; Liebmann! 
Herb. of Copenhagen. Yet all the garden specimens had been 
stated to be Mexican. Now, as to Plewrothallis obscura, A. Rich., 
Gal., there has been no specimen used at all for the diagnosis, 
* Holio lanceolato acuto; floribus obscure brunneis 2—3 ad basin 
folio.” It is described from out of Galeotti’s sketches, now in 
our hands. The plant agrees pretty well as to the leaves, yet the 
flowers are smaller, deep chocolate-brown in lieu of cinnabar-red, 
and the lip is represented entire. Neither Galeotti’s own private 
collection, now in my possession, nor Achille Richard’s her- 
barium, contain any materials ; yet Galeotti’s sketches were very 
nice, but without any analytical details, nor would he appear to 
have much cared whether the lip was entire or trifid. The figure 
shows four stems, two without flowers, one with two flowers, one 
