45^ HYPNACE/E. 



/Autoicous ; stem-Is. flexuose, only the upper secund 10. fluitans 



"]\ Dioicous ; Is. falcato-secund, faintly plicate, especially when dry 



[_ 10* ■ exannulatum 



o /Slender ; Is. crowded, \-\ line long 8. Sendtneri 



\ Robust ; Is. more distant, i£-2^ lines long 8*. Wilsoni 



/Ls. not auricled, red-brown along base 12. vernicosum 



^\Ls. auricled 10 



/Ls. narrow at base ; autoicous _ 11. uncinatum 



\ Stem Is. deltoid or ovate at base; dioicous II 



/Stem very radiculose ; stem Is. deltoid at base 14. connnutatum 



\ Radicles few or none ; stem ls. less expanded at base 12 



/Ls. scarcely \ line long; nerve weak, usually about half-way 14*. sulcatum 



I2 \I 



LLs. long ; nerve strong 14.*. fahaluvi 



7. Hypnum aduncum Hedw. (Amblystegium Kneiffii B. & S., 

 p.p.) (Tab. LVI. O.). 



Stems usually slender and soft, not so firm nor so robust as 

 in most of the following species ; green or yellowish green, rarely 

 either yellow, reddish or dark coloured; extremely variable in 

 mode of branching, etc. Stems typically erect, more or less 

 regularly pinnate ; leaves not crowded, falcato-secund, usually 

 moderately but not strongly hooked at the tip of the stems and 

 branches ; not plicate, entire or faintly sinuose at margin, ovate- 

 lanceolate or oblong-lanceolate, longly and finely acuminate, wide 

 and cordate at base, strongly excavate, with decurrent auricles 

 enclosing a more or less semi-circular space. Nerve moderately 

 strong, reaching f length of leaf or into the acumen, but usually 

 not nearly approaching the apex. Areolation rather short and 

 lax, thin-walled, linear-flexuose, about 80 /* in length, but some- 

 times more and often less, 10-12 times as long as wide ; towards 

 base becoming slightly laxer, linear-subrectangular, at angles 

 suddenly inflated, large, hyaline, forming distinct, hyaline, 

 decurrent auricles. Branch-leaves narrower. Perichaetial bracts 

 lightly plicate. Seta long, 1-2 inches. Capsule oblong, inclined, 

 curved. Annulus present. Dioicous. 



Var. fi. Kneiffii Schp. (Hypnum Kneiffii Schp. olimj. 

 Stems prostrate or ascending, with irregular erect divisions, 

 which are simple or irregularly branched, not or scarcely 

 pinnate ; very slender ; leaves distant, erecto-patent or spread- 

 ing, hardly falcate or secund; very slightly falcate, not hooked, 

 at apex of stems ; wider and shorter, ovate-lanceolate, more 

 shortly acuminate. Nerve rather shorter ; cells shorter, about 

 40-60 p, 8-10 times as long as broad ; wider towards base. 



Var. y. gracilescens Schp. Very small and slender, irregularly 

 or sub-pinnately branched ; leaves very small, widely triangular- 

 ovate, shortly acuminate ; nerve very short and often faint, 



