` Aptychus EE n. dee: cade lati inferne dense congesti 
Picanto intricati superne laxi virescentes: surculus ramis longius- 
eulis gracilibus eurvulis horride teretiusculis; folia caulina laxe patula 
madore remotiuscule patula, e basi angustiore parum impressa cellulis 
SENS indistinetius vesiculosis parvis chryseis vel pellueidis veluti fi- 
_ brosa in laminam anguste oblongam margine plerumque distinete re- 
. volutam subeucullato-coneavam plus minus aeuminatam integerrimam 
producta, obsolete binervia, e cellulis anguste ellipticis areolata; peri- 
chaetialia minora pauca longiuseule subulata; theca in pedunculo lon- 
_ giusculo flexuoso flavo aetate rubro tenui apice eurvulo erecta longius- 
eule peranguste cylindrica arcuata ore constricta, madore cylindrico- 
| oblonga ore aequalis; peristomii brevis dentes interni dilute lutei integri. 
. Caetera nulla. | 
. Ab A. concinno aliquantulum simili raptim distinguitur dispositione 
foliorum atque theca angustieima, cylindrica longe pedunculata. 
— Aptychus (Potamium) leucodontaceus n. sp.; cespites pollicares 
rides laxissime adhaerentes; caulis tenuiter leucodontaceus teretiusculus 
brevissime tenue cuspidatus, ramis similibus brevibus erectis dichotome 
divisus ascendens; folia caulina dense imbricata parva madore erecto- 
patula ramulum subturgescentem sistentia, e basi angustiore plerumque 
parum constricta cellulis alaribus paueis vesieulosis chryseis ornata in la- 
minam cochleariformi-ovalem vel oblongam brevissime obtuse acuminata 
ani > acumen subeucullata integerrima, margine uno latere hic illic re- 
oluta, enervia, e cellulis angustissimis densis viridissimis glabris areo- — 
perichaetialia angustissime subulata multo minora; theca in pe- Te 
ri eurvulo fiavo-rubente € erecta SE ovalis macrostoma, — 
lo Set conico, peristomio —? 
Fructus in ramo unico plures laterales brevissime  pedicellai prob! | 
niles vel vetusti gy mnostomi observati. Ex habitu Potamio decep- 
Mitt. inter congeneres americanos similis. sed multo rubustior , 
s — africanos Patania, rn n. "- ex meng s 
