Mathewsiane. N. O. Musci. 
SAB, CARY; 
GyMNosTomuM SETIFOLIUM. Hook. et Arn. 
Densissime czespitosum elongatum ramosum, foliis subulato- 
setaceis serrulatis, nervo crasso excurrente, seta ob innova- 
tiones szepe laterali superne inflexo-curvato, capsula globosa 
levi, operculo minuto conico depresso. 
4B. Huamantantga, Peru. Mathews, n. 586. 
Planta densissime cespitosa, radiculosa, superne ramosa, viridis. 
Folia erecta, numerosa, imbricata, stricta, subulato-setacea, 
suprema longissima, denticulata, nervo crasso longe excur- 
rente: perichetialia reliquis similia. Seta terminalis, vel ob 
innovationes lateralis, foliis subimmersa, apicem versus insig- 
niter inflexa, levis. Capsula globosa, ore subcontracto paul- 
ulum elevato. Operculum parvum, breviter conicum. Peri- 
stomium nullum. 
This plant has the habit of Conostomum and of Bartramia 
ithyphylla. and B. stricta: but if generic characters are to be 
rigidly derived from the peristome these four must belong to as 
many different genera. Bartramia ithyphylla has a double per- 
istome, each of a remarkable structure: B. stricta, as far as our 
investigations have gone, possesses a single one, and thatinterior: 
Conostomum has only the exterior, and the present Gymnostomum, 
as We at present consider it, (together with a few others belong- 
ing to Brown’s Genus Glyphocarpa,) is destitute of both. The 
same peculiarities we have elsewhere noticed in certain mosses 
with the habit of Bryum cespititium. 
Fig. 1. Tuft, nat. size. f. 2. Portion of a plant. f. 3. 4. 
Leaves. ff. 5. Perichztium and leaf. J. 6. Capsule with its 
operculum. /- 7. Mouth of the Capsule :—magnified. 
