414 J. B. W. LlNDENBERG, 



striam medianam papillosam utrinque cristato-marginatam 

 fingentibus Bisch.). 



3. Oxymitra Bischoff. 



Riccia Mich. pluriumque auct. Rupinia Corda (non Linn.). Tesselli- 

 neac spcc. Duniort. 



Involucrum commune nullum. Perianthia (involu- 

 cra propria Bisch.) pyramidata, in sulco frondis longitudinali 

 aggregata, glabra, apice demum pertusa. Calyptra glo- 

 bosa, in stylum abiens, sessilis, demum sporangio connata. 

 Sporangium globosum, sessile, indehiscens. Elateres 

 nulli. 



Antherae? nudae in superficie frondis, papilliformes, se- 

 riatae, immarginatae (antheridia immersa, dense congesta, 

 cuspidibus exsertis striam medianam papillosam immargina- 

 tam conficientibus Bisch.). 



4. Spiiaerocarpus Mich. 

 Targionia Dicks. 

 Involucrum nullum. Perianthia pyriformia, gla- 

 bra, apice pertusa , in superficie frondis aggregata. Caly- 

 ptra stylo deciduo coronata, pedicellata. Sporangium 

 demum subliberum, globosum, indehiscens. Sporae elate- 

 ribus destitutae. 



( Antheridia? globosa, per frondis substantiam sparsa, 

 mutica Bisch.). 



