Hepaticce of North America. 75 



2. M. thuja Dumort. Stems creeping, sparingly 

 branched, simply pinnate; branches short; leaves fuscous- 

 green, closely imbricate; upper lobe strongly incurved, obtuse 

 with the apex mucronulate or 2-4-denticulate; lower lobe ob- 

 long, somewhat acute, repand and somewhat denticulate; am- 

 phigastria broadly ovate, reflexed-spreading, subentire. (Jnn- 

 </<'nn<(it/<( fJn(j(( Dicks.) 



//,&. 111. (Wolf). (Eu.) 

 Bib. Hep. Europ. p. 24. 



3. M. Sullivanti Aust. Stems mostly simply pinnate, 

 the apex strongly decurved in drying; leaves somewhat erect, 

 the ventral margin close, strongly involute toward the apex; 

 cells large punctate-stelliform; inner involucre broadly carinate 

 beneath, the carina biangular; otherwise near M. inrohita 

 Hampe. 



Hob. Alleghany Mts. (Sultivant). 

 Bib.Torrey Bull. Ill, 15. 

 E.rsic. Hep. Bor.-Amer. No. 94. 



ff Stems somewhat bi-tripinnate. 

 J Lower lobe of leaves narrow, ovate-lanceolate. 



4. M. involuta Hampe. Stems irregularly pinnately 

 decompound; leaves closely imbricate, subrotund, deflexed, re- 

 pand or entire, the ventral margin slightly involute, the base 

 decurrent, the lobe narrow; amphigastria approximate, quad- 

 rate-ligulate, entire. 



Hab. Banks of rivers, So. States (Lesqnereu.r, Beyrich). 



Bib.Syn. Hep. p. 282. 



Exsic. Hep. Bor.-Amer. No. 93. 



JJ Loiver lobe of leaves broader. 



5. M. platyphylla Dumort. Stems irregularly bipin- 

 nate; upper lobe of leaf roundish-ovate, the basal margin more 

 or less undulate ; the inferior lobes smaller, obliquely oval or 

 subrotund, the margins deflexed; amphigastria round-obovate 

 with reflexed margins, subentire; involucral leaves denticulate 

 or entire; mouth of inner involucre nearly entire. (Junyer- 

 mania platyphylla L., Lejeunia platyphplla Corda.) A variety 

 is Junyermania platyphylloidea Schwein., (Madotheca platy- 

 phylloidea Dumort.), (Austin). 



