420 FOUR NEW SPECIES OF MOSSES. 



omnino estriata, subenervia, nempe nervo gemello brevissimo, 

 flavicantia. Seta erecta, ]a3vis, lineas quatuor longa. Cap- 

 sula erecta, oblonga, superne angustior, ore annulato. Peris- 

 tomii exterioris denies lineari-subulati, erecti, rufescentes, 

 interioris cilia flava. Operculum couicum, subrostratum, 

 rostello obtuso oblique. 



From its nearest ally, Plerogonium Jtavescens, Hook. 

 Mvisc. Exot. t. 155 : tbis Moss differs in tbe short seta, and 

 in tbe leaves whicb are destitute of striae. It has considerable 

 affinity with Pterogonium repens, Schwaegr. Suppl. t. 27., 

 which is a true Ntckera. 



Tab. XXIV. A. — Fig. 1. Plants of Nechera breviseta; nat. 

 size. f. 2. Fertile portion. /. 3 — 6. Leaves. /. 7. Trans- 

 verse section of a leaf. f. 8. Capsule from which the oper- 

 culum is removed. /. 9. Portion of the peristome: — mag- 

 mjied. 



2. Daltonia nervosa (Hook, and Wils.), caule suberecto 

 subramoso, foliis ovato-acuminaiis margine reflexis nervo 

 continuo, capsula urceolata subsessili perichsetio immersa, 

 operculo conico, calyptra dimidiata. — Tab. XXIV. B. 



Hab. In arboribus prope New Orleans^ cum D. heteromal- 

 la commixta, Drummond. 



Statura D. heteromall^e, cui similis. Folia magis patula, 

 siccitate erecta, nee appressa, margine evidenter subrevoluta, 

 nervo ad apicem producto. Perichaetialia longiora, lanceo- 

 lata, dorso papillosa. Seta brevissima, subnulla. Capsula 

 urceolata, basi rotundata. Peristomii exterioris denies sede- 

 cim erecti, stricti, anguste subulali, albidi, absque linea media, 

 interioris cilia breviora, concolora. Annulus vix ullus, ob- 

 scurus, simplex, margine operculi adnatus. Calyptra latere 

 fissa. 



Obs. D. heteromalla has a distinct annulus, and a consider- 

 able border surrounds the peristome, which has the teeth in- 

 flexed at the base, and distinctly marked with a medial line. 

 The leaves, too, in that species, are very different from those 

 of the Moss now (riven. 



