76 CRYPTOGAMIA. 



A large species, with soft, shining, yellow foliage. Probably dioicous. 

 The principal stem creeping, subterranean, leafless; branches fascicled, 

 mostly simple, ascending, 2-3 inches long, thick, tumid, obtuse, sub- 

 clavate. Leaves crowded, erect-patent, elliptical, acuminulate, strongly 

 plicate, serrulate above, ecostate ; of a thin and firm texture ; cellules 

 of the leaf minute, linear (their length to their diameter as 10 to 1), 

 arranged in somewhat transverse rows, those at the base of the leaf 

 shorter and broader, reddish-orange. Periehsetia, for the size of the 

 plant, very small, immersed in the leaves near the top of the branches. 

 Capsule more than half concealed in the perichsetial leaves, ovate- 

 cylindrical, with a very short, erect pedicel. The lower perichsetial 

 leaves ovate and lanceolate, long-acuminate; the upper ones elongated- 

 oblong, suddenly acuminate, not plicate, strongly and irregularly den- 

 tate above ; the costa commencing a little below the apex of their 

 lamina, and extending into a long, straight, rigid, dentate seta. Teeth 

 of the peristome linear, acuminate, closely articulated, transversely 

 striolate, with a broad, median line; the basal membrane of the cilia, 

 broad and plicate ; rostrum of the operculum straight and long. 

 Calyptra mitriform, scarcely covering the operculum. Archegonia 

 about 24, with paraphyses half their length. 



This species has a strong resemblance to Pilotrichum plicatum, C. 

 Mull, but its peristome and perichsetial leaves are widely different. 

 The capsules in our specimens are either too old or too young for a 

 satisfactory examination. 



Plate 18, ft — Endotrichum settgerum: plant, of the natural size. 

 Fig. 1. A branch, showing the position of the fruit. 2, 3. Leaves. 

 4. Portion of a leaf, showing the reticulation. 5. Cellules of the 

 same. 6. Base of leaf, with portion of stem. 7. Strap-shaped leaves, 

 or paraphyllia, at the base of the perichsetial branch. 8, 9. Cross-sec- 

 tions of a leaf. 10. Young capsule, with operculum and calyptra. 

 11. Old capsule. 12. Young capsule. 13. Calyptra. 15. Perichse- 

 tium, with capsule. 16. Peristome, mutilated. 17, 18. Perichsetial 

 leaves. — Details magnified. 



