Cheetham: Bryologists at Austwick. 169 
It was shown that the pointed apical cell clearly differ- 
entiates T. tamariscinum under the microscope, and also that 
its tripinnate branching was a good field character being only 
very occasionally acquired by T. Philiberti in its variety 
pseudo-tamarisct, and in this case, as also in typical Philibertz, 
it is quite easy to see the filiform point of the stem leaves with 
a pocket lens. 
Under the microscope 7. recognitum is a much coarser 
plant than 7. delicatulum, the cells and pappille being con- 
siderably more elongate, the apical cell of the branch leaf of 
T. delicatulum is generally as long as broad, whereas of 7. 
vecognitum is almost twice as long as broad. The stem leaves 
are usually quite distinct, though, until one has seen 7. 
vecogmitum it is possible to imagine that an elongation is 
occasionally noticable in T. delicatulum; this, however, is 
never of the distinct type found in 7. recognitum where the 
shorter cells of the lamina seem to finish somewhat abruptly 
at the base of the apex. Again, the stem leaf margin of T. 
vecognitum is generally plane or very slightly recurved, whereas 
that of T. delicatulum is strongly recurved. 
In the field the difference between the two in the extreme 
types is fairly satisfactory, the general impression that is 
gained is that delicatulum is in somewhat swollen tufts, the 
ends of the stems being curved down and a certain neatness 
thus acquired, the tufts also are mostly quite pure; on the 
other hand 7. vecognitum is generally much mixed with H. 
molluscum, etc., and has a straggling habit. Another small 
point is that the branches of T. recognitwm have an attenuate 
appearance, the central axis of the branch being considerably 
lengthened out. 
The general facies of 7. delicatulum and T. recognitum, 
as seen near Austwick, is quite at variance with Limpricht’s 
description of the continental specimens, so it is necessary to 
reiterate the fact that these remarks apply to the local plants. 
Mr. Dixon, in drawing attention to these plants, pointed 
out that true T. recognitum appears to be distinctly rare in 
Britain, occurring in older herbaria from Matlock and Ingleton, 
whereas most of the modern gatherings are misnamed and 
belong chiefly to Philibert: ; this is certainly the case with 
previous Yorkshire records, which must be revised. T. Phili- 
bertt will now become a fairly well-distributed Yorkshire 
species, it was first recognised as such in IgtI, where it is 
reported in The Naturalist on page 232. 
The only member of the series seen in fruit was 7. famaris- 
cinum although careful search was made seeing that the fruiting 
characters of the fertile plant are valuable for classification. 
T. Philibertt was always found in dry places, on walls, 
limestone screes, etc.; 7. vecognitum and delicatulum on 
1915 May 1. 
