87 

 ADDITIONS TO THE ALGJE OF 

 WEST YORKSHIRE. 



WM. WEST, F.L.S., 

 Lecturer in Botany and Materia Medica at the Bradford Technical College. 



Since the issue of the ' Flora of West Yorkshire,' I have examined — 

 with the valued and critical assistance of my son, G. S. West — a large 

 number of gatherings of algae, some of which are additional species 

 to the district, while others are but new localities, though some of the 

 latter are very interesting. Although I have collected from hundreds 

 of places, extensive districts are almost entirely unrepresented, and 

 those that are fairly represented can by no means be said to be 

 exhausted. Collecting at all periods of the year, many forms are 

 examined and drawn which cannot possibly be determined ; for 

 example, species of (Edogonium, on account of absence of oospheres, 

 this genus being always easy of recognition in a barren condition 

 because of the screw-like appearance of the projections caused by 

 the remains of the earlier cell-walls, by reason of the peculiar 

 method of growth in length of the cells by intercalary development. 



One point I particularly wish to draw the attention of workers to, 

 and that is, that they should make careful observations at all times 

 of the year, and even for several years if possible, with regard to 

 those forms they find in some easily accessible locality. Observations 

 of this kind are of great value, as many of those species generally 

 considered as autonomous are now by many believed to be but 

 different stages of development of other undoubted species. 

 Dr. Hansgirg, of Prague, has studied this phase of the subject 

 attentively and extensively. Students should read his observations, an 

 excellent precis of which is given by that veteran and industrious 

 worker, the Rev. Francis Wolle, in his " Fresh-water Algae of the 

 United States.' Dr. Braxton Hicks' paper in the ' Quarterly Journal 

 of Microscopical Science' for i86r is well worth reading, and those 

 students who will take sufficient trouble to examine suitable corners 

 near upland country paths will find the material necessary for 

 abundant confirmation of Dr. Hicks' observations. 



In the following list the species new to West Yorkshire are 

 preceded by an asterisk. Records from gatherings made by others 

 than myself are followed by the names of the collectors. 



The classification followed is that of Cooke's Fresh-water Algae. 

 The Allerton mentioned is three miles W.N.W. of Bradford. The 

 Hawksworth mentioned is five miles N. of Bradford. 



March 1889. 



