28 



We insert the followmg concise analysis of their characters and 

 distinguishing marks. 



Myrio^jhylliim olternrflortim, DC. Sterile flowers alternate, about 

 6, in a leafless spike ; spike nodding when in bud, afterwards erect ; 

 fertile flowers in axillary whorls of about 3 flowers, at the base of the 

 spike : tab. 2854. 



Stagnant pools and ditches. 



St. Leonard's Forest, Sussex. Whixall Moss; near Colemere; Berrington Pool; 

 Twyford Vownog, near Westfelton : all in Shropshire. Small lake near Snowdon. 

 Braid Hills, near Edinburgh. Isle of Wight. Guernsey. 



Smaller and more elegant than M. spicatum. 



Bryum Ludwigii, Schwsegr. Stems ascending ; leaves ovate, con- 

 cave, obtuse, flaccid, entire, their nerve ceasing below the apex ; cap- 

 sule pendulous, sub-pyriform ; lid conical, obtuse : tah. 2855. 



Clova Mountains. 



Remarkable for its lax, obtuse, pellucid foliage, which is glossy and scarcely twist- 

 ed when dry. 



Bryum annotinum, Hedw. Stem very short ; leaves crowded, erect, 

 lanceolate, nerved, subserrulate at the apex; capsule oblong-pyriform, 

 pendulous ; lid convex, apiculate : tah. 2856. 



Moist sandy places, usually barren ; frequent. 



Winwick Stone Delph, near Warrington. 



Closely resembling B. nutans, but with smaller, more crowded and less deeply co- 

 loured foliage ; the barren shoots bearing club-shaped fingered gemmae in the axils of 

 the leaves. Diflering also from B. carneum in the form of the capsule and greater 

 length of the fruit-stalk. 



Herniaria ciliata, Bab. Stems herbaceous, prostrate, clothed with 

 very minute decui-ved hairs ; leaves orbicular-ovate, ciliated ; clusters 

 of sessile flowers axillary upon the lateral branches and distinct : tab. 



2857. 



Gravelly soil ; tops of walls and hedge-banks. 



Lizard Point, Cornwall. Near Port de Fer, Guernsey, 



Usually confounded with H. glabra, t. 206, but very distinct. 



Potamogeton prcelongus, Wulf Leaves all submersed, elongate- 

 oblong, amplexicaul, obtuse and hooded at the end, entire ; stipules 

 without wings ; nut obliquely ovate, keeled on the back when dry ; 

 8}nke cylindrical, many-flowered ; peduncle very long, cylindrical : 

 lab. 2858. 



Ditch adjoining the river Thames, at Caversham Bridge near Reading. River 

 Waveney, between Scole and Beccles. Scotland, frequent. River Blackwater, Co. 

 Kerry, Ireland. 



Leaves membranous, with about 5 strong nerves extending quite from the base to 

 the apex, with several (iibout 2) weaker intermediate nerves and numerous transverse 



