COLLECTED IN TROPICAL AFRICA 57 



Intermediate between P. convolutum, Brid. and P. macrophyllum, Dzy. et Molk. In the firm substance 

 of its leaves it agrees with the first, but their outline is more nearly that of the last-named species. The 

 specimens vary from 4 to 5 inches in height. 

 Tab. VI. fig. 20. 1. Plant (natural size) ; 2. leaf (magnified). 



Plagiochila, Nees et Mont. 

 P. NECKEROiDEA, Mitten. Caule repente, ramis iterate tlichotomis ; foliis basi imbricatis 



divarieatis ovato-lanceolatis apice obtusis bidentatisve, margine dorsali recurvo inte- 



gerrimo, ventrali apiceque parce dentatis, cellulis parvis olblongis interstitiis angustis ; 



involucralibus dentibus spinosioribus ; periantMo obovato truncato compresso, labiis 



spinoso- dentatis . 

 Hab. On trees. Niger [Barter). 



Very nearly resembling P. abrupta, L. et L., but with leaves composed of cells very much smaller and 

 with thin walls. From P. disticha, L. et L. (gathered also by Barter), it is immediately distinguished by 

 the plants being scarcely altered when dry, and the different form of the perianth. The more robust 

 stems have much the appearance of P. cristata Sw., but they are far smaller and the leaves are not 

 cristatebehind. 

 Tab. VI. fig. 21. 1. Plant (natural size); 2. leaves, 3. perianth and involucral leaf (magnified). 



Chiloscyphus, Oorda. 



C. OBLONGiFOLius, Mitten. Caule repente parce ramoso ; foliis horizontalibus divergentibus 

 oblongis parallelogrammaticis apice integris sinuatis uni- bi- tridenticnlatis, cellulis 

 interstitiis obscuris grossiuscnlis, amphigastriis parvis bipartitis laciniis extrorsnm 

 unidentatis, uno latere in folium anguste decurrente ; perianthio (juvenili) laciniis 

 dentatis. 



Hab. On moist rocks, Onitscha; and on oil palms. Brass; Niger [Barter). 



Dark brown. In size and habit resembling the Oriental C. argutus, Nees, but with leaves of a different 



substance and truncate at their apices. 



Tab. VI. fig. 22. 1. Plant (natural size) ; 2. portion of stem with leaves and amphigastria ; 3. the perianth 

 spread open. 



Lepidozia, Nees, Ldbg. et Gottsclie. 



L. STJCCiDA, Mitten. Caule procumbente inordinate pinnato, ramis decurvis flagelliformi- 

 attenuatis ; foliis caulinis erecto-patentibus caulem latitudine vix superantibus ovali- 

 oblongis, apice insequaliter brevi bi- tri- quadridentatis, ampliigastriis parvis quadri- 

 partitis ; rameis majoribus imbricatis rbomboideo-ovalibus, apice superiore sinu parvo 

 bidentatis, cseteroquin integerrimis, amphigastriis parvis trifidis, cellulis oblongis 

 magnis pellucidis. 



Hab. On moist rocks. Nupe ; Niger [Barter). 



Somewhat resembling L. Wallichiana, Gottsche, and L. cetitipes, Taylor, but remarkable for the rhom- 



boidal subentire leaves of its branches. 



Tab. VI. fig. 23. 1. Plant (natural size) ; 2. a portion of the stem, 3. portion of a branch with leaves 

 (magnified). 



VOL. XXIII. I 



