2 Dr. Greville's Description of some New Mosses 



which the genera of mosses are formed, it must be regarded as an 

 Anictangium, (or Schistidium of Bridel ;) but it must be confessed 

 that natural habit is opposed to such an arrangement, and that the 

 calyptra is altogether similar to that of some Orthotricha. 



Fig. 1. Portion of a tuft, natural size. 2. Leaves. 3. Young 

 capsule enveloped by its calyptra. 4. Capsule with operculum. 

 5. Capsule after the lid has fallen. 6. Mature calyptra, magnified. 



II. Didi/77iodon reticidatum, Gillies' MSS. 



D. caule brevi, foliis oblongo-ovatis apiculatis reticulatis carina- 

 tis margine arete recurvato nervo superne incrassato, capsula ovato- 

 cylindracea. Tab. I. 



Hab. On moist banks at the base of the mountains near Men- 

 doza, 4000 feet above the level of the sea. 



Plant somewhat tufted. Stems two or three lines in length, in 

 my specimens imbedded in soil to the very summit. Leaves im- 

 bricated on all sides, of a lurid green or brown colour, somewhat 

 rigid, (incurved and very rigid when dry,) erecto-patent, ovate- 

 oblong, apiculate, deeply hollowed in the upper part, and carinate 

 on the back, the margin entire and much recurved ; nerve passing 

 to the summit, where it forms the apiculus, strong and incrassated 

 upwards. The substance of the leaves is pellucid and reticulated, 

 especially in their lower half. Fruit-stalk two or three lines in 

 length. " Capsule ovate- cylindrical, but variable in length, erect, 

 of a dark-red colour ; the lid shortly and obtusely rostrate. Peri- 

 stome composed of thirty-two pale slender teeth approximated in 

 pairs, the whole united at the base by a narrow reticulated mem- 

 brane of a thinner substance than the teeth themselves. 



The only other known species of Didymodon with which the 

 present plant has any relation, is the British D. nervosum. Both 

 are distinguished by leaves wider than those of their congeners, and 

 by a strong nerve which is considerably thickened in its upper 

 part. Didipnodon reticulatum is well marked by the greater length, 

 the carination, the recurved margin, and reticulated pellucid sub- 

 stance of the leaves, and the cylindraceous form of the capsule. I 

 have not been able to obtain a perfect peristome among the speci- 

 mens brought home by my friend Dr. Gillies, but what remains is 

 amply sufficient to determine the genus. 



Fig. 1. Plants, natural size. 2. Leaves. 3. Capsule. 4. Sum- 

 mit of a capsule, with remains of the peristome. 5. Portion of the 

 |>eristome, magnijied. 



III. Tortula carinata, Gillies' MSS. 



T. caule elongato ramoso, foliis oblongo-ovatis carinatis margine 

 revolutis, nervo in pilum desinente, perichsetialibus acutis vaginan- 

 tibus, capsula cylindracea, operculo longe subulato. Tab, I. 



Hab. On moist rocks and banks near El Puente del Tollo, in 

 the valley of the Maypu, Chile, 3368 feet above the sea. 



Plant growing in tufted masses of a reddish-brown or green- 



