CASH: FOSSIL FRUCTIFICATIONS OF YORKSHIRE COAL MEASURES. 451 
from Elland, from Huddersfield, and from the Upper Foot Coal of 
Stronesdale, Saddleworth, Yorkshire, and also from near Oldham, 
Lancashire. 
Calamostachys Casheana. Williamson. 
The only other species of Calamostachys which to my knowledge 
occurs in Yorkshire is Calamostachys Casheana, Williamson. This 
was described by Professor Williamson in his eleventh memoir on 
the organisation of the fossil plants of the Coal Measures from a 
specimen discovered in the Halifax beds by the late Captain Aitken. 
The importance of this specimen, which in other respects agrees in 
the main in all its details with C. Binneyana, lies in its spores. 
In the slightly oblique and longitudinal section of this fruit-spike 
all the sporangia of the uppermost of the three fertile verticils, as 
well as those to the right of the middle one are filled with micro- 
spores. The three to the left of the middle verticil, and all the four 
of the lowermost ones contain macrospores. The microspores are 
about '0031 in. and the macrospores occur as large as '01, most of 
them equally '0093 in. The latter exhibit an outer sporangial wall, 
as well as an inner one, whilst a dark coloured mass exists in the 
centre of most of the examples. 
Since the publication of the paper here alluded to I have 
secured specimens from the Upper Foot Bed, Strinesdale, Saddle- 
worth, in Yorkshire but close on the Lancashire Border. Figures 
from photographs of these are given in Plate 
In our report on recent Researches amongst the Carboniferous 
Plants of Halifax " at 56th Meeting of the British Association, held 
at Birmingham in September, 1886, Dr. Williamson refers to 
those specimens, and to some still better preserved examples which 
I handed over to him for study. 
" We have also obtained a fresh example of the remarkable 
heterosporoug form of Calamostachys, described in Part Xll. of the 
" Organisation of the Fossil Plants of the Coal Measures," and which 
latter example previously constituted the only known specimen of 
a Calamitean plant with bisexual fructification. This second 
example seems to establish clearly the distinctness of this fructifi- 
cation from that of the allied Calamostachys Binneyana; and I 
now propose that it should be known as Calamostachy Casheana." 
