380 RECENT ADDITIONS TO OUR MOSS FLORA. 



without my searching for the plant in the spot indicated. G. amarella, 

 var. /3. (Bromfield) occurs rather plentifully on tlie adjacent down. 

 I have not been in tlie vicinity in the month of May since the date 

 given at page 160. — Robert Tucker. 



|lcports» 



RECENT ADDITIONS TO OUR MOSS FLORA.— Part III. 



By R. Braithwaite, M.D., F.L.S. 



(Plate CXI.) 



DiCRANACEiE. 



Gampylopus. — Of this fine genus, numbering about 120 species, 

 several have recently been added to our flora, most of them, however, 

 only known in a barren state ; as there is also a great general re- 

 semblance among them, they present some difficulty to beginners, and 

 I have, therefore, given descriptions of all our species, and append 

 also a table of dift'erential characters, which may be of service. 



Hampe and some other bryologists still combine the genus with 

 Dicranum, though apart from the fringed calyptra, a peculiar facies 

 stamps the species, indicating a truly natural genus. In several the 

 leaves become falcato-secund, when they occur in dry localities. 



* Leaves lioary at point. 



t Leaves auricled at base, with the enlarged alar cells . 1. C. atrovirens. 

 ft Leaves not auricled. 



Nerve one-third width of leaf base ; bah* point 



short ' 2. C. brevipilus. 



• Nerve three-quarters width of leaf base ; hair point 



longer 3. C. introflexus. 



** Leaves unicolorous. 



t Leaves auricled at base. 



§ Stems tomentose, with radicles. 



Stems tall ; leaves longly subulate. 



Lamina suddenly narrowed at one-third of 

 length of leaf; upper cells iucrassate, 



elliptic 4. a Shawii. 



Lamina gradually narrowed upward ; upper 



thin walled, narrowly rectangular . . . 5. C. alpinus. 



