NOTE ON PLATYNEMA. 57 
. eomalibus longioribus ligulatis ubique minutissime et densissime 
papillosis opacis, perichætialibus ovato-acuminatis laxius areolatis, 
nervo evanescente, theca in pedunculo mediocri gracili recta ovali- 
pyriformi sub orificio parum constricta.—Operculum et calyptra 
desunt. 
This curious little species has much the habit of Z. compactus, but 
appears to be nearest allied to Z. tenerrimus, from which it differs in 
several particulars. 
47. Zygodon Reinwardtii, Braun. Z. denticulatus, Tayl. Lond. Journ. 
Bot, 1847, p. 329. 
48. Orthotrichum speciosum, Nees. O. longifolium, Tayl. Lond. Journ. 
Bot. 1846, p. 45. 
49. Orthotrichum /azifolium, Wils. in schedula ; monoicum, Md pulvi- 
natum elatum fastigiato-ramosum luteo-virens, foliis caulinis lan- 
ceolatis acuminatis basi angustatis plicatis carinatis margine 
revolutis evanidinerviis e cellulis minutis papillosis areolatis, 
perichætialibus basi latioribus laxioribus apice angustioribus acu- 
tissimis, theca immersa oblonga levi pallescente siccitate octies 
plicata, operculo conico apiculato, calyptra scaberrima straminea ——— 
apice purpurea totam fere capsulam obtegente, peristomii externi 
dentibus 8 bigemmatis siccitate revolubilibus pallidis, ciliis 8 den- _ 
tes longitudine et latitudine æquantibus ochraceis, basi e cellula- - 
rum tribus seriebus compositis. 
Closely allied to O. leptocarpum and O. speciosum, but a more slen- - 
der plant; the leaves are narrower and longer, as well as more loosely _ 
set, and little altered in drying ; the cilia are remarkably wide, and at 
the base composed of several series of cells, which diminish aime De 
upwards; in substance they resemble those of O. speciosum. rte 
50. Macromitrium Jongifolium, Brid. vol. he p. 309 et 738. Schlothei- 
mia oblonga, Tayl. Lond. Journ. Bot. 1846, p. 47. : 
(To be continued.) 
Note on PLATYNEMA ; by G. N. WALKER ARNOTT, LL.D., Professor of 
Botany, Glasgow. = 
In 1833 Dr. Wight and I described, in Jameson’s Edinb. Phil 
Journal, a plant which we called Platynema laurifolinm, belonging to 
VOL, II. bs S 
