34 ICONES MUSCORUM. 



FISSIDENS HYALINUS, Hook, et Wils. 

 Tab. 21. 



Plants perpusilloe, tenerrima), gregarie vel caespitulose de- 

 gentes, glauco-virides. 



Caulis 1-2 lineas altus, simplex, erectus vel declinatus, basi 

 radiculis hyalinis copiose instructus. 



Folia mollissima, explanata, 3-4-juga, inferiora minima, su- 

 periora mnlto majora, lanceolata, oblongo-lanceolata, interrupte 

 anguste marginata, e cellulis amplissimis hyalinis hexagono-are- 

 olata, duplicatura ad medium producta ; lamina dorsali lata ad 

 basin evanescente ; costaomnino deficiente. 



Flores dioici : feminei soli noti, terminales, diphylli. 



Capsula oblonga, erecta, macrostoma, leptoderma, brevius 

 pedicellata ; peristomii dentibus gracilibus rubellis solidis dense 

 articulatis ; calyptra cylindraceo-conica operculi rostrum longi- 

 usculum solum tegente ; sporis minimis. 



Fissidexs hyalinus, Hook. & Wils. in Lond. Jour. Bot. 1841, p. 89, t. 2; 

 Sulliv. Muse. Alleghan. No. 180; Mosses U. States, p. 24. 



Hab. " Moist, rocky ledges, Bank Lick, on Cassidy's farm, near 

 Cincinnati, Ohio." T. G. Lea. 



This species, remarkable for the absence of a costa in its leaves, 

 has been found only by the late Thomas G. Lea, who detected it 

 in the year 1839. It has since been carefully searched for in 

 the locality above mentioned, but without success. 



TAB. 21. — FlSSIDENS HYALINUS. 



1. Plants nntimili magnitudine. 11. Pars peristomii cum sporis. 



2, 3,4. Plants. 12. Operculum et calyptra. 

 5, 6, 7. Folia. 13, 14. Calyptrse. 



8, 9. Areolatio folii. 15. Operculum. 

 1 0. Capsula opcrculata cum calyptra in situ. 



