Dr. T. Taylor on five new species of Cryptogenic Plants. 879 



Surculus biuncialis et ultra. Rami subsecundi, semiunciales. Folia 

 nitida, lutescentia, tenuissime areolata, siccitate haud tortilia. 

 Fructus et flores desunt. 



Very much like Pterigynandrum nigrescens /3. illecebrum (Bridel, 

 Br. Un. ii. 193), but differing thus : leaves more acuminate, 

 serrulate; areola? smaller and narrower; the foliage too, when 

 dry, is somewhat glossy. 



The typical Pt. nigrescens (Swartz) is distinguished from these 

 two forms thus : leaves narrower, of thinner texture, more lax, 

 pale green. Still it is doubtful, in the absence of fruit, whether 

 the three forms should not be referred to one species. 



Pilotrichum may (for the present) be considered as a subgenus 

 of the Bridelian genus Neckera, with hairy calyptrae. It is 

 adopted as a genus by Hornschuch in the !* Flora Brasiliensis/ and 

 was first proposed by Pal. de Beauvois. f yin 



Omalia, Brid. 

 O. lentula (nov. sp.) ; caule distiche sub-bipinnatim ramoso, foliis 



distichis ovato-falciformibus acuminatis serrulatis enervibus, peri- 



chsetialibus lanceolato-attenuatis. 

 Hah. in arborum cortice ? Port Royal ; legit G. M'Nab, M.D. 



Caules bi-triunciales. Rami complanati, breves. Folia nitidissima, 

 laete-viridia, tenuissime areolata, superne serrulata. Florescentia 

 dioica ? 



Evidently allied to our British Omalia trichomanoides (Bridel), 

 Hypnum trichomanoides (Hooker and Taylor), but readily distin- 

 guished by its nerveless, acuminated and more falciform leaves 

 and more shining habit. It has still greater resemblance to 

 Neckera (Distichia) glabella (Bridel), which probably belongs to 

 the genus Omalia (the true Distichia having the leaves rugose or 

 undulated). From the last-named moss, ours differs in its 

 smaller size and ovate-acuminate leaves. 



XXXVIII. — Diagnostic Characters of five new species of Crypto- 

 gamic Plants from Jamaica. By Thomas Taylor, M.D.* 



Leskea, Hedw. 



1. L. angustifolia (Tayl.) ; caule exiguo erecto subramoso, surculis 

 flexuosis, foliis laxis distichis ex angusta basi lineari-oblongis 

 obtusis apiculatis apice dentatis ruptinervibus substriatis surcu- 

 lorum ad apices* arete compressis ad basin minutis vel subnullis. 



On Danaa alata (Sm.), Jamaica. In Dr. R. K. Greville's Herbarium. 

 Three to four lines high, pale yellowish green, shining. Leaves 



* Head before the Botanical Society of Edinburgh, 11th Nov. 1847. 



27* 



