COLLECTED IN TROPICAL AFRICA. 53 



Leskea, Hedw. 



L. SUBPALCATA, Mitten. Monoica ; foliis caulinis hastato-subulatis caulem vestitum lati- 

 tudine aequantibus, e basi patiila erectis, marginibus niinutissime erenulatis siibinte- 

 gerrimis, nervo valido in apice evanido, cellulis niinutis rotundatis obscm-iusculis ; 

 rameis ramulinisque subfalcatis patenti-incurvis compressis ligulato-lanceolatis, 

 apicibus latis subacutis, nervo pallido sub apice evanido, marginibus niinutissime 

 erenulatis, dorso minute jDapillosis ; pericbsetialibus e basi ovali longe subulatis 

 attenuatis integerrimis, nei'vo percurrente, cellulis elongatis pellucidis ; theca in 

 pedunculo rubro asperrimo. — L. gratce simillima. 



Hab. Moist rocks. Onitscha ; River Niger (5«?-^er', 1424). 



Closely resembling L. grata, which was also gathered by Mr. Barter, but distinguished by the leaves of 



its ramuli being ligulate and not ovate, and by its entire perichEetial leaves. 



Tab. V. fig. 7. 1. Plant (of the natural size) ; 2. a cauhne leaf, 3. a leaf from the branches, 4. peri- 

 chaetium and male flower (magnified). 



L. XiGERiANA, Mitten. Monoica synoicave, caule foliolis vestito ; foliis patentibus bastato- 

 ovatis acutis, nervo percurrente, marginibus minute erenulatis, cellulis rotundatis 

 minutis obscuris papillosis ; rameis divergentibus complanatis parum asymmetricis 

 ovato-lanceolatis acutis, nervo sub apice evanido, marginibus erenulatis ; perichae- 

 tialibus erectis, e basi lata ovata longe (interdum subito) in subulani contractis, angulis 

 paucis crenatis integerrimisve ; theca in pedunculo elongate rubro asperrimo ovali 

 horizontali cernuave, operculo subulato sequilongo ; peristomio externo dentibus valde 

 trabeculatis, interno processibus subsolidis ciliis in unum coalitis sequilongis inter- 

 positis. — L. gratm similis. 

 Hab. River Niger [Vogel). 



Resembling very nearly X. ^rat'a = //2/J3HMOT (/ra/iMB, Beauv. ; but its branches more generally simple, 

 cauline leaves not incurved from a patent base, those of the ramuli longer, divergent, and very much com- 

 pressed, the perichastial leaves longer and not lacerate. From L. subfalcata it differs in the form of its 

 cauline, and less ligulate ramuline leaves. 



Tab. V. fig. 8. 1. Plant (of the natural size) ; 2. a leaf from the stem, 3. a leaf from the branches, 4. a 

 perichcetial leaf, 5. capsule (magnified). 



Callicostella, Mitten, Muse. Ind. Orient. I. c. p. 136. 

 C. AFRICANA, Mitten. Synoica, liabitu staturaque C. Merkelii ; foliis in series denas 

 dispositis compressis, marginibus e medio ad apicem argute serrulatis, nervis binis ad 

 apicem percurrentibus ibique dorso serrulatis papillosis ; seriebus tribus dorsalibus 

 reliquis dimidio fere brevioribus erecto-patentibus appressis ovatis obtusis brevi- 

 acuminatis, cellulis parvis abbreviatis fere rotundatis suljobscm'is ; seriebus lateralibus 

 utrinque binis patenti-divergentibus e basi ovata uno latere infiexo-liugulatis obtusis 

 apiculo brevi semitorto, cellulis superioribus oblongis, inferioribus laxioribus prosen- 

 cliymaticis ; serie ventrali media cauli parallela appressaqiie ovato-lanceolatis brevi- 

 acuminatis, cellulis laxis prosenchymaticis fere laevibus ; pericba?tialibus patentibus 

 e basi ovata in acumen lanceolatum angustatis ; theca in pedunculo elongato flex- 



