ON SOME CRITICAL SPECIES OF SCOTTISH MOSSES 109 



base as large as 0.006 mm., a posterior row of bulging cells, 

 increasing downwards from 0.005 to - 01 mm - near base, where 

 they are still seen. Stereids, minute, are seen in abundance sur- 

 rounding the second row of cells, but are also seen everywhere 

 throughout the section. Large hollow or vesicular auricles are 

 present, colourless, but in older leaves turning a light brown or 

 reddish-brown colour. Sterile. 



The other moss has also leaves which tend to become cucullate at 

 the apex, and belongs to the section of which C.flexuosus is the type. 



CAMPYLOPUS RUBIGINOSUS. Densely tufted, i inch or more in 

 height, bright green above, with a narrow yellowish band beneath 

 nearly as in the previous moss, this colour deepening to a bright 

 red towards the base ; stems sparingly branched ; leaves appressed 

 when dry and slightly incurved in upper part, straight when moist, 

 lanceolate from a slightly dilated base, shortly acuminate, very 

 concave above, bluntish at apex and tending to become cucullate, 

 serrulate on upper margin and with hyaline blunt teeth on the back 

 of nerve in same upper region ; central basal cells large, oblong, 

 slightly chlorophyllose or hyaline, 0.03 to 0.045 by - 12 to 0.016 

 mm., smaller outwards and near margin of the same size as those 

 just above, upwards, cells quadrate or rhomboid, o. 01 to 0.014 nim. 

 across, chlorophyllose, extending to apex in two to five perpendicular 

 rows where, however, cells are longer and narrower (0.022 to 0.032 

 by 0.005 to 0.006 mm.); auricles large, hollow, composed of very 

 large hexagonal hyaline cells (as large as 0.08 by 0.04 mm.), seldom 

 tinged of a reddish colour. In older leaves the space at base is all 

 hyaline, and slopes up to a point on the margin. Nerve one-fourth 

 to one-third breadth of leaf near base, tapering and vanishing at or 

 near apex. In thin cross section the nerve shows an anterior row 

 of pellucid cells, 0.005 to 0.012 mm. ; a second row of cells, 0.006 

 to 0.014 mm. ; no proper third row nor bulging posterior row, but 

 instead the alternately depressed and elevated cells on posterior wall 

 from apex to base, 0.005 to 0.008 mm., a peculiarity not hitherto 

 seen. 



The deep-red lower zone is not owing to the presence of red 

 radicles, which are rather sparse, but to the colour inherent in the 

 cell walls. The peculiarities are such as to warrant a separation 

 from either C. flexuosus or its var. paradoxus. 



One of the very few mosses rescued from the herbarium of the 

 late Mr. Alex. M'Kinlay is a Campylopus. The locality is not 

 stated on the slip to which it is pasted, but as the date is still 

 legible, viz., July 1865, I am inclined to believe that he secured 

 it on the mountains of Clova. This suspicion is strengthened by 

 the fact that the Rev. J. Fergusson sent me one nearly identical 

 with it from Glen Prosen, a neighbouring valley. 



