170 CONTRIBUTIONS TO THE BRYOLOGY 



DESCR. Planta late denseque crespitosa. Caules prostratae intricato-implexae, ramos 

 breves erectos teretes 3-4 lineares simplices vel ramulosos ernittentes. Folia undique 

 imbricantia erecto-patentia ovata longe-acuminata, vel ovato-lanceolata concava, margine 

 inferiore reflexa, fere toto ambitu serrata, costa paulo ultra medium evanescente instruc- 

 ta, tenuissime lineari-areolata, cellulis ad angulos basis externos amplis quadratisque, e 

 lutescente viridia nitentia. Perichaetialia convoluta-oblonga ex apice lato rotundo lacini- 

 ato-dentato in productionem linearem serratam flexuosam subiter desinentia. Antheridia 

 archegoniis immixta ad vaginulae basim; paraphjsibus numerosissimis. Capsula oblonga, 

 nunc subaequalis erectiuscula, nunc altero latere longiore convexiore paulo inclinata, ore 

 subobliquo. Peristomii exterioris denies lineari-lanceolati dense trabeculati, linea mediali 

 notati ; interioris processus e membrana lata carinati lineares pertusi longitudine dento- 

 rum, ciliolis rudimentariis vel nullis interpositis. Annulus compositus revolubilis. Pe- 

 dunculus e caule flexuoso-erectus 5 - 7-lineas longus, basi lenissime papillosus, superne 

 sinistrorsum, inferne dextrorsum tortilis. Operculum convexo-conicum, plus minus elon- 

 gatum, rectum vel incurviusculum. Calyptra non visa. 



TAB. I. Fig. 1. A plant of the natural size. 2. The same, magnified. 3. A portion of stem. 4. The 

 peristome. 5. Capsules. 6. Opercula. 7. The annulus. 8. The perichaeth. 9. Archegonium, antheri- 

 dium and paraphysis. 10. Vaginula and reproductive organs. 1 1. Perichsetial leaves. 12. Stem and branch 

 leaves. 13. Portions of leaf showing the reticulation. 14. A vertical section of the peristome, showing the 

 columella, &c. All magnified except Fig. 1. 



2. SCHISTIDIUM AMBIGUUM (sp. nov.) i monoicum, exiguum, pulvinato-csespitulosum ; 

 caule parce ramoso ; foliis oblongo-lanceolatis patulo-incurvis apice plus minus 

 cano-piliferis, perichaetialibus multo majoribus erectis elliptico-lanceolatis in pilum 

 hyalinum grosse dentatum productis fere suae longitudinis ; capsula immersa ob- 

 longo-ovali, operculo convexo-conico brevi-rostrato ; calyptra cuculliformi. 



HAB. On dry rocks, near Santa Fe, Mr. Fendler. 



The long, serrated, diaphanous points of the large perichsetial leaves, the oblong-oval 

 capsule, the small subconic operculum, and especially the cuculliform calyptra of this 

 species, seem to require its separation from the variable Schistidium confertum, which in 

 all other respects it closely resembles. 



Tetraphis pellucida, Hedw. Timmia megapolitana, Hedw. Weissia controversa, Hedw. W. curvirostris, 

 Brid. Chiloscyphus polyanthos, Cord. Fegatella conica, Cord. Fimbriara fragrans, N. ab E. Junger- 

 mannia barbata, Schreb. Madotheca platyphylla, Dumort. Marchantia polymorpha, L. Radula complanata, 

 Dumort. Reboulia hemisphserica, Raddi. 



