Supplement.] 227 



Leptotrichum avimontanum Schimp. in Sched. 



Ditrichum vaginans Hampe in Flork 1867, p. 182. Limpr. in Raben. D. kr. fl. Laubm. 

 i, 499, f. 155 (1887). Davies in Irish Nat. 1901, p. 164. 



Didymodon tenuis Sendt. Milde Bry. Siles. 135. 



Aongshcentia Lamyi Boul. Muse, de I'Est 553 (1872). 



Leptotrichum vaginans Schimp. Syn. 2 ed. 140 (1876), excl. /3. HuSN. Muse. gall. 62, t. 18 

 (1884). 



Ditrichum lineare (Sw.) Lindb. in Sched. 



Dioicous ; about \ in. high, in small dense yellow-green tufts. Plants 

 slender, erect. Leaves stiff, erect, from a longish ovate base, gradually 

 sharp-pointed, almost tubular at apex from the involute margin, nerve 

 strong, ending in the point, excurrent in the perichaetial bracts, margin 

 above curved, entire or obsoletely denticulate at apex ; cells smooth, 

 rectangular, elongated at base. Perich. bracts sheathing, subulate at 

 points ; seta reddish, capsule erect, longish cylindric, pale brown, lid 

 conical, teeth of peristome of two unequal legs, often more or less united, 

 papillose. 



Hab. — On sandy earth or clay, very rare. Fr. 10. 



Turfy ground on Colin mountain, Co. Antrim, Ireland, sterile (/. H. Davies 1901) ! ! 



This insignificant little moss is found scattered in the mountain districts of 

 Germany, Bavaria, and the Tyrol, but seldom in fruit. 



DITRICHUM ZONATUM {Brid) 



In dense tufts, glossy yellow-green above, transversely banded alter- 

 nately with dark and yellowish-brown below. Stem slender and brittle, 

 with few branches. Leaves stiff, erect, appressed when dry, short, from a 

 longish ovate base gradually pointed, channelled above, the margin not 

 incurved ; cells rectangular and quadrate. Fruit unknown. 



Thus Limpricht describes our plant, and also separates another species as 

 Ditrichum nivale (C. Muell.) to which belong the synonyms Leptotrichum nivale 

 C. M., L. vaginans var. j8. glaciale Schimp., and Z. tenue j8. glaciate Schimp., and 

 the fruiting plant. It is found at the Unter Aar glacier and Morteratsch glacier in 

 Switzerland. 



Dixon has a var. scabrifolium, with leaves densely papillose on both sides, 

 Journ. Bot. 1902, p. 378, summit of Ben Laoigh {Dixon, 1901), and Ben Chalum 

 (1898). Ben Lomond {Mrs. Graham). 



Seligeria tristicha Brid. in Schrad. Journ. i, 44 (1800), has precedence of 

 S. trifaria (JVeisia) in the same work, ii, 283 (1801). 



Blindia trichodes (Wils.) Lindb. is referred by Limpricht to B. acuta as 

 var. Seiigeri Brid. Mant. p. 59 (1819). 



