BRYUM. 



117 



tent, canaliculate ; nerve strong, disappearing below the 

 point j colour a deep yellow-green, shining. This and the 

 two following species constituted the Hedwigian genus 

 Meesia, characterized by the short obtuse teeth of the pe- 

 ristomium. 



Br. trlquetrum ; stems elongated, branched ; leaves lanceo- 

 late, carinate, acute, serrated, reticulated ; capsule pyriform, 

 erecto-cernuous ; fruitstalks very long. (TAB. XXVIII.) 



Br. trlquetrum. Turn. Muse. Hib. p. 115. Engl Bot, t, 2394. 

 Mnium triquetrum. Linn. Sp. PL p. 15/8. Meesia longiseta. Hediv. 

 St. Cr. v. 1. t. 21, 22. Diplocomium longisetum. Web. et Mohr Fl 

 Cr. Germ. p. 874. Moug. et Nestl. n. 327. 



HAB. On the borders of some lake in the north of Ire- 

 land. Dr. Scott. 



The only station for this fine plant in the British domi- 

 nions is that very vague one given above. We have seen 

 the solitary specimen that has been communicated by Dr. 

 Seott to Mr. Turner. It is intermixed with Bryum deal- 

 latum. The present plant is remarkable for the great length 

 of its fruitstalks, and for its broad, carinated, and serrated 

 leaves, which are often trifariously inserted. Mohr has se- 

 parated this from the two other species of Meesice in con- 

 sequence of the segments of the inner membrane being 

 connected by a reticulated substance ( " opere reticuloso 

 ffonnexa"). We have ourselves seen portions of a cellular 

 <or reticulated membrane attached to these teeth, which 

 probably in an earlier stage connected them for their whole 

 length. The exterior teeth are short and obtuse, as in the 

 preceding species. 



Br. deallatum; stems short, leaves lanceolate, acute, plane, 

 serrated at the points, reticulated; capsules pyriform, nearly 

 erect. (TAB. XXVIII.) 



Br. dealbatum. Dick*. Pi. Crypt, fasc. 2. t. 5. f. 3. Engl Boi. 

 t. 1571. Turn. Mmc. Hib. p. 115. Meesia dealbata. Swartz Muse. 

 Suec. t. 5./. 10. Hedw. Sp. Muse. t. 4\.f. 6-9. 



HAB. Boggy mountains in Scotland and Ireland. 



This is less rare 5 than Bryum tric/iodes, to which it has 

 much affinity ; but the leaves, when they pome to be exa- 

 mined, are of a different form and texture, and the fruit- 

 stalks are shorter in proportion to the Jength of the stems. 

 Although this has all the habit of a Meesia, it departs from 

 the characteristic mark of that geuus, in having the exter- 

 nal teeth nearly as long as the internal peristome, and they 

 jcajn scarcely be called obtuse. 



