64 CRYPTOGAMIA. 



Hab. Mountains behind Honolulu, Oahu; Mountains of Kauai, 

 Sandwich Islands. 



41. Hypnum pickeringii, Sulliv. (Tab. 15.) 



H monoicum, pusillum, ccespitans; caulibus ascendentibus ramosis, ramis 

 apice subuncinatis ; foliis oblongo-lanceolatis filiformi-attenuatis plus 

 minus falcato-secundis ecosiatis cellulis tenuissimis parce papillulosis, 

 alaribus magnis inflatis ; capsula ovali subpendida, operculo huge 

 adcidari-rostrato, pedicello longiusculo superne grosse tuberculato. 



Hypnum Pickeringii, Sulliv. in Proceed. Amer. Acad. Art. Sci. (January, 1854). 



Hab. Mountains behind Honolulu, Oahu ; District of Puna, Hawaii ; 

 Sandwich Islands. Tahiti, Society Islands. 



A small pluinulose species, forming dark-yellow, compact mats. 

 Stem irregularly branched ; the branches ascending and usually sub- 

 falcate at their summits. Leaves crowded, patent-incurved or slightly 

 falcato-secund, oblong-lanceolate, concave, gradually tapering into a 

 long filiform subtubulous serrated point, ecostate; cellules minute, 

 linear, more or less papillulose : at each of the basal angles are 2 or 3 

 large subquadrate, inflated yellowish cellules. Perichsetial leaves 

 oblong-convolute, suddenly tapering into a long, serrulate point. 

 Pedicel five or six lines long, slender, weak ; above, strongly tubercu- 

 late; below, smooth. Capsule minute, oval subpendulous ; mouth, 

 coral red. Teeth of the peristome light yellow, the medial line broad 

 and transparent ; cilia from a broad membrane, perforated on the keel ; 

 ciliolse single. Operculum acicular-rostrate, long as the capsule. Cel- 

 lules of the cuculliform calyptra, spirally arranged. Monoicous : male 

 gemmae containing three or four antheridia, paraphysated. 



This species, compared with Hypnum scaberrulum, Mont, has the 

 upper half only (not the entire length) of the pedicel, tuberculate. 

 Its leaves are much less falcate, and are slightly (not strongly) papil- 

 lose. 



Hypnum hamatum, Doz. & Molkb. has remarkably long, secund, 

 hamato-falcate leaves, with cellules destitute of papillae, and shorter 



