]0 GYMNOSTOMUM. 



* Stem elongated, Iranched. 



1. G. lapponicum; leaves lineari-lanceolate, crisped when dry; 



the perichaetial ones broadly ovate, their margins involute ; 

 capsule turbinate, striated." (TAB. VI.) 



G. lapponicnm. Hedw. St. Cr. v. 3. t.5. A. Moug. et Nestl n.309. 

 Engl Bot. t. 221 ft. Anictangium lapponicura. Hedw. Sp. Bryum 

 lapponicum. Dicks. 



HAB. On rocks in alpine situations. 



This species as well as G. cestivum and G. viridissimum, 

 from their elongated stems and ramification, seem to be- 

 long to the genus Anictangium ; besides, two out of the 

 three have a remarkable form of their perichaetia, and the 

 leaves have a curiously dotted appearance when seen under 

 a lens and a pellucid nerve. But the calyptra is dimidiate, 

 and therefore brings these plants under our characters of 

 Gymnostomum. The stems of the species here described 

 are from one to two inches in length, the leaves dark green, 

 and the capsule singularly deeply striated, or rather perhaps 

 furrowed. 



2. G. cestivum ; leaves lanceolate, twisted when dry ; the peri- 



chaetial ones broadly ovate, their margins involute ; capsule 

 oblong, smooth. (TAB. VI.) 



G. sestivum. Hedw. Sp. Muse. t. 2.f. 4-7- G. lutecium. Engl. Bot. 

 t. 2201. (not of FL Brit, according to Mr. Davies's specimens.) G. tri- 

 stichon. .Wahl. Lapp. Anictangium compactum. Schwaegr. Suppl. t.\\. 



HAB. On wet rocks. 



The stems are from one to three inches in length, and 

 very much tufted ; the leaves short and rigid : but we do 

 not see that they are regularly trifarious in their insertion, 

 as Wahlenberg states them to be. 



3. G. viridissimum , leaves broadly lanceolate ; capsule ovate; 



lid obliquely rostrate. (TAB. VI.) 



G. viridissinuim. Engl Bot. 1. 1583. (fig. bad.) Bryum viridissimum. 

 Dicks. Dicranum viridissimum. Smith Fl. Brit. Turn. Muse. Hib. p.7\. 

 Grimmia ? Forsteri. Engl. Bot. t. 2225. Bryum Forsteri. Dicks. 



HAB. On trees. 



In the circumstance of its growing upon trees this spe- 

 cies is unlike the remaining British congeners. The stems 

 are scarcely an inch in height. The leaves and indeed the 

 whole habit of the plant, greatly resemble the Zygodon co- 

 noideum ; but our plant is much larger, and in every respect 

 is so like our authentic specimens of Grimmia ? Forsteri, 

 Sm. that we have little hesitation in reducing this plant to 

 G. viridissimum. . 



