TRICHOSTOMUM. 2ig 



Although this plant bears some resemblance to Trick, tortuosum, that species 

 may usually be known from the present by the paler colour, less lurid and less 

 frequently yellow ; the denser, longer leaves, and the habitat, which is usually drier, 

 rarely in such humid spots ; the latter point is also a point of difference between Tr, 

 tenuirostre and Tr. mutabile, which in some forms it occasionally resembles ; under 

 the microscope the distinction becomes clearer ; the obliquely ascending hyaline cells 

 in Tr. tortuosum at once separating that species ; while Tr. temiirostre, though 

 sometimes having straight, broad, shortly pointed leaves almost exactly resembling 

 some forms of Tr. mutabile, will be recognised by the larger, less obscure areolation, 

 the nerve not distinctly excurrent, and the margins strongly crenulate-denticulate, 

 toothed, or sinuose. It is also usually a more robust plant than that, with more 

 distant and longer leaves. Some barren forms of Diphyscium foliosum, notably the 

 var. acutifolium might easily be mistaken for this plant, but are of a more rigid and 

 solid texture, often with a reddish brown tinge, and with much more obscure areolation 

 and nerve when viewed with the microscope. Tr. hibernicum has the leaves wider 

 at the base, with much more distinct, incrassate upper areolation. 



5. Trichostomum hibernicum Dixon. (Tortula hibemica 

 Mitt. ; Mollia hibemica Lindb., Braithw. Br. M. Fl. ; Barbula 



cirrifolia Schp., Syn.) (Tab. XXXI. L.). 



Tall, slender, in loose tufts, yellowish green, 2-4 inches high. 

 Leaves not crowded, from a short erect sub-sheathing base 

 flexuose-patulous or squarrose, crisped and incurved when dry ; 

 from a wide, shortly oblong or obovate base gradually longly 

 lanceolate-acuminate , tapering to an acute point , i|-2 lines long ; 

 margin hardly undulate, very finely crenulate-papillose ; nerve 

 vanishing in the apex, or reaching just beyond ; cells at base 

 rectangular, hyaline, rather suddenly passing into the shorter, 

 coloured upper cells, not ascending higher at margin ; upper 

 areolation small, very distinct (rather obscure in the young leaves), 

 incrassate, subquadrate-rounded or shortly oblong-elliptic, faintly 

 papillose ; one or two rows at margin sometimes paler. Capsule 

 cylindric. 



Hab. Wet rocks ; Killarney ; Brandon Mt. , Kerry. Fruit very rare. 



A more slender plant than either Tr. tenuirostre or Tr. tortuosum, with smaller, 

 more slender, less undulated leaves, expanded at the base, and more distinct areolation, 

 the basal quite different from both. It is the Anactangium Hornschuchianum of 

 Wils. Bry. Brit. ; but the true A. Hornschuchianum Funk (in Hoppe & Hornsch. 

 Crypt, select.) has smooth leaves, very slender at the points, denticulate above the 

 base, etc. 



A few old capsules only have been found, with the peristome too imperfect for 

 description. The species has not been found outside Ireland. 



6. Trichostomum inclinatum Dixon. (Tortula inclinata 

 Hedw. fil.; Barbula inclinata Schwgr., Schp. Syn.; Mollia 



inclinata Lindb., Braithw. Br. M. Fl.) (Tab. XXXII. B.). 



In wide flat twits, yellowish green, \-i inch high, stems robust, 

 fragile. Leaves crowded, erecto-patent, rigid, not enlarged at the 



