170 Rhodora [August 



istic hue, but in shaded localities the color tends to be much paler. 

 The cross-section of the stem, as in M. sphacelata, shows a distinct 

 border of thin-walled cells, but this is often broken down and indefi- 

 nite in weathered specimens ; the cells just within this layer are very 

 thick-walled but grade into the thin-walled cells of the interior. The 

 leaves are more deeply divided than in M. sphacelata, and their 

 divisions, although commonly rounded, are sometimes obtusely 

 pointed; the leaf-cells have slightly thickened walls and distinct 

 trigones but are more delicate than in M. etnarginata. The reddish 

 rhizoids, which account for Limpricht's varietal name, may usually 

 be detected on the stems and branches themselves, especially near 

 the base, as well as on the stolons. They are not confined to M. 

 media but may also be found in M. etnarginata and M. sphacelata, 

 where, however, they are scanty and developed only on the stolons. 

 Even in M. media these rhizoids are sometimes very few in number 

 and bleached out until they are almost colorless, so that they do not 

 always constitute a reliable character. 



4. JUNGERMANNIA CORDIFOLIA Hook. Brit. Jung. //. J2. 1816. 



Aplozia cordifolia Dumort. Hep. Eur. 6i. 1874. Solenostoma cordi- 

 folium Steph. Bull, de I'Herb. Boissier, II. i : 499. 1901. Many 

 years ago Russell ^ doubtfully referred to /. cordifolia a sterile hepatic 

 which he had collected in bogs at Plymouth, Massachusetts. He 

 described his specimens as being "furnished with capitula and with 

 white pulverulent granules," so that he evidently had a gemmiparous 

 plant before him. His determination, therefore, was probably incor- 

 rect as the gemmae of /. cordifolia are unknown. A second New 

 England record, from Oakes Gulf in the White Mountains,^ has also 

 been proved erroneous, the specimens in question being referable to 

 Nardia obovata.^ The true /. cordifolia, however, was discovered by 

 Miss Annie Lorenz and the writer at Rainbow, Connecticut, during 

 the June meeting of the Connecticut BotanicaJ Society in 1903; it 

 may therefore be looked upon as an addition to the New England 

 flora and also to that of the eastern United States. The species is 

 already known from Cape Breton and from other parts of Canada 

 and is abundant from the Rocky Mountains westward. The Rain- 

 bow specimens grew on wet and gently sloping rocks on the banks 



1 Boston Jour. Nat. Hist. 3 : 466. 1845. '^ Hep. Amer. J13. 



•' Evans, Proc. Wash. Acad. 2: 298. 1900. 



