HYPNUM. 



93 



obtuse, less truly distichous, and their structure is, under the 

 microscope, more reticulated. This is the variety y. obtu- 

 sifolmm of Turner, the H. obtumtum of Wahlenberg, and 

 the H. Donniunum of Smith. We would gladly follow the 

 two last-mentioned able naturalists in keeping this distinct 

 as a species from a, did we not possess specimens in an in- 

 termediate state, both with regard to the form of the leaf, 

 its reticulated structure, and even in the direction of the 

 leaves. All agree in having the same almost cylindraceous 

 inclined capsule and conical lid, and in having a short, 

 forked, or double nerve. 



Ste?ns (taken in conjunction with the leaves) more or less 

 cylindrical, never plane. 



\ . Leaves spreading on all sides of the stem |j . 



A. Leaves uniform in their direction (not squarrose). 



a. Nerve reaching to or leyond the point. 



* Leaves without serralures. 



6. H. medium ; leaves ovate, obtuse, concave, entire, nerve 

 reaching to the summit ; capsule cylindrical, nearly erect ; 

 lid conical. (TAB. XXIV.) 



H. medium. Dicks. Crypt, fasc. 2. p. 12. Turn. Muse. Hib.p. 142. 

 Engl Bot. t. 12/4. H. inundatum. Dicks. Turn. Muse. Hib.Engl. 

 Bot. t. 1922. Leskea polycarpa. Ehrh. Crypt. Hedw. Moug. et 

 Nestl. n. 224. Dill. Muse. t. 42. f. 65. & t. 31. f. 27. B. 



HAB. Trunks of trees, near the ground. 



Whole plant much crowded in its growth, of a very lurid 

 colour. Leaves opaque, the margins recurved ; in which 

 particular it differs from the Leskea paludosa of Hedw. as 

 well as in the nerve, which in the latter disappears before it 

 reaches the point. 



H. tenellum ; leaves fasciculate, erect, lanceolato-subulate, 

 entire, their nerve reaching to the summit; capsule ovate, 

 eernuous ; lid rostrate. (TAB. XXIV.) 



H. tenellum. Dicks. Cri^pt.fase. 4.t.\l.f. 12. Turn. Muse. Hib. 

 p. 170. Engl. Bot. t. 1859. (figure of the leaf bad.) 



HAB. On rocks, especially such as are calcareous, and on 

 old walls. 



This moss is but little known to Continental writers, as 

 appears by Mohr's observation that it agrees well with 



|| In opposition to " leaves second." 



