58 MR. MITTEN ON SOME NEW SPECIES OF MUSCI. 



Lejeunia, Gottsclie et Ldbg. 

 (Fhragmicoma.) 



L. EXCAVATA, Mitten. E.amis caespitosis dichotome ramosis ; foliis divaricatis iinbricatis 

 rotundatis, apice decvirvis sinu parvo miiiute bidentatis, basi lobulo oblongo unidentato 

 complicato, ampliigastriis appressis orbiculatis foliis dimidio minoribus, cellulis parvis 

 rotundatis ; involucralibus conformibus, lobulis minoribus ; perianthio oblongo obtuso 

 appresso, dorso concavo, ventre convexo, Isevi. 



Hab. On trees. Niger {Barter). 



In size and appearance resembling Omphalanthus geminiflorus, Nees, but more nearly allied to Phrag- 



micoma Mackaii, Dumort. 



Tab. VI. fig. 24. 1. Plant (natural size); 2. portion of stem with leaves and amphigastria ; 3. perianth 

 and involucral leaves; 4. transverse section of perianth. 



{Acrogonia.) 

 L. ASTROIDEA, Mitten. Epiphylla, maculas astroideas formans ; foliis patentibus rhom- 

 boideis integerrimis, angulo externo superiore acuminato, inferiore rotundato lobulo 

 minuto inilexo ; cellulis heteromorpMs, minoribus rotundatis interstitiis crassiusculis, 

 majoribus 3-5-seriatim inordinatimve per folium dispositis, una majore semper in 

 angulo inferiore partim a lobulo obtecta ; ampliigastriis alternis ad basin in lacinias 

 duas patentes subulatas divisis. 

 Hab. On living leaves. Niger [Barter). 



Loosely appressed to the surface of the leaves, in company with a species of Radula which, in so far as 

 it can be judged of in a barren state, does not differ from R. Ch-evilleana, Taylor.' This Lejeunia evidently 

 belongs to the same curious section as L. Krausiana and a number of other tropical species, for the most 

 part growing on the surface of leaves, and producing a turbinate pentagonal perianth, the angles being- 

 more or less produced into a horn-like point. 

 Tab. VI. fig. 25. 1. Plant (natural size) ; 2. portion of stem with leaves and amphigastrium (magnified). 



Anthocekos, Miclieli. 

 {Notothylas, SulHvant.) 

 A. decurvus. Mitten. Fronde pusilla planiuscula ambitu radiatim lobata, lobis sinuatis 

 dentatisque, involucris bre-\dbus decurvis lacinulis sparsis vestitis, capsula inclusa 

 subsessili, sj)oris luteis, columella nulla. 

 Hab. On the earth with a Riccia. Niger (Barter-). 



Resembling Notothylas valvata, Sullivant (in ' Memoirs of the American Academy of Arts and Sciences,' 

 vol. iii. new series, pi. 4) ; but, in proportion to the size of the frond, the involucra are much smaller. The 

 capsule is not protruded in the few specimens examined, but seems entirely enclosed in the involucre ; 

 no trace of the suture or columella M'as visible. Anthoceros Brentelii, Gottsche, found in the West Indies, 

 is another species of this curious group ; its capsule is protruded, and opens with a suture. 

 Tab. VI. fig. 26. 1. Plant (natural size) ; 2. a portion with an involucre, 3. spores (magnified). 



