198 Mr. R. Spruce on the Musci and Hepaticse of Teesdale. 



Very fine by the road- side between the High Force inn and Winch 

 Bridge. 



This magnificent species was detected a few years ago by Bruch 

 near Deux Fonts, and it has since been observed in the Vosges, 

 Jura, and other mountain regions of continental Europe. The 

 authors of ^Bryol. Europ.^ state that they have never found inter- 

 mediate states between it and B. fontana, and that it constantly 

 preserves the characters they have assigned to it. I have similar 

 testimony to offer; for I distinguished the two, by habit alone, 

 almost on my entering Teesdale, and during my stay I continued 

 to observe them almost daily without detecting any feature cal- 

 culated to shake my conviction of their being specifically distinct. 

 I shall now state the differences which appear amply to justify 

 their separation. In B. calcarea the stems are stout, densely 

 csespitose ; leaves secund (usually patent in the other), of larger 

 size, narrower, and tapering to a longer point, all lanceolato- 

 acuminate (not ovato-acuminate and lanceolate on the same 

 plant) : areolation wider : nerve remarkably strong and solid, and 

 offering a great contrast to that oi B. fontana. These differences 

 are most striking on the floriferous branches of the male plants. 

 The male flowers consist of fewer leaves, all of which are acumi- 

 nate and nerved throughout -, but the inner perigonial leaves in 

 B. fontana are very obtuse, with an abbreviated or obsolete nerve*. 

 The peristome is smaller, the outer teeth shorter and broader, 

 and the texture of the outer paries of the capsule is less dense 

 near its mouth. 



18. B. fontana, Sw. Less frequent than the last, but fruiting 

 beautifully in Hell Cleft. 



19. B. gracilis, Florke. At the White Force, attaining a large 

 size; rocks below the High Force. 



20. B. Halleriana, Hedw. In the clefts of basaltic rocks near the 

 High Force, with fruit in a good state. 



21. B. ithyphylla, Brid. Frequent on basaltic rocks, especially on 

 Cronkley and Holwick Scarrs. 



22. B. pomiformis, Hedw. Rocky situations near the High Force, 

 &c.; less frequent than the last. Var. |3. crispa, intermixed with 

 B. Halleriana. 



23. Bryum acuminatum, B. and S. "Monoicum; caule simplici 

 innovationibus ramoso, basi radicante ; foliis caulinis inferiori- 

 bus parvulis, remotis, ovato-lanceolatis, erectis, superioribus 

 fastigiatis, confertis, duplo-majoribus, lineari-lanceolatis, 1 — 2 

 plicatis, margine valde revolutis, apice serratis, costa ad apicem 

 producta ; capsula longicoUa, gracili, horizontali, operculo co- 

 nico." — Bryol. Eur. 



* Tlie term 'ecostata' applied to them by Bruch and Schimper is too 

 strong. 



