INTIIODUCTION TO CRYPTOGAMIC BOTANY. 501 



times grows in water, and has then, as indeed it has at all 

 times in some measure, the habit of Fontinalis. A few species 

 of Neckera are referred to PilotricJmm, but true Neckerce 

 have flattened pinnate stems, and a cucullifoim ealyptra. 

 Daltonia, which is represented in Ireland by D. splachnoides, 

 is distinguished by its ciliated ealyptra ; its cylindrical stems 

 seem to associate it with Gryphwa better than with Hookeria. 

 One of the most curious genera belonging to this tribe is Den- 

 dropogon, Schimper,* founded upon a moss which hangs down 

 in great masses from trees in Mexico, like Meteorium or 

 Usnea. It is an admirable substance for packing, and first 

 became known to Schimper from being used as packing for a 

 collection of succulent plants. The fruit is nearly that of Cry- 

 phcea, but the perichjetial branches are so elongated that the 

 moss is cladocarpous, after the fashion of the cladocarpous 

 Grimmice. Spiridens connects this tribe with Hyp7ieL The 

 habit is that of Hypnwni triquetrum, but the sessile fruit and 

 conical ealyptra are those of Cryphcm. 8. Reinwardtii is 

 found in Java, Tahiti, and the Philippine Islands, and some- 

 times is a foot or more in length. In fact, it is one of the finest 

 species of the order. Miiller has proposed a distinct tribe for 

 a plant related to Gryphwa, under the name of Erpodiacew, 

 on account of its flat bifariously imbricated stems, gymno- 

 stomous sporangia, and loose reticulation. It is founded on 

 Ancectangium Domingense, Bridel.-f- 



6. HooKERiEi, Br. & Sc. 



Stems mostly flattened, creeping, irregularly branched ; 

 leaves reticulated ; areolae mostly large ; sporangium horizon- 

 tally cernuous, thick, succulent on a succulent elongated 

 peduncle ; ealyptra campanulate, smooth ; peristome double. 



560. The mosses belonging to this tribe are remarkable for 

 their succulent texture. The mitriform ealyptra at once sepa- 

 rates them from Hypnei, apart from their peculiar habit. 

 Hookeria lucens is one of our most beautiful mosses, and 

 very striking, from its large pale shining green leaves. It is 



* Bot. Zeit., 1843, p. 377, tab. 1. 

 t Bot. Zeit., 1843, p. 773. 



