840 



ON THE tWO VALERIANS 



G. pseudonitidulum Nord. 



C. Iceve Bab. 



C sexangulare Lund. 



C. polygonum Naeg. This was 



broad, 11 /x long, with the apex 

 quite rounded, and the notch 

 not so gaping as in the type. 



icrasterias papillifera Breb. 



noticed up to 27 /x in breadth. M. truncata Balfs. 

 C. undulatum Corda, var. crenu- Staurastnim muticum Breb., var. 



latum Wolle. 

 C. pseudopyramidatum Lund. 

 C. pseudotaxichondrum Nord. 

 G. triplicatum Wolle. 

 G. punctulatum Breb. 

 (7. co?ispersum Balfs. 

 C. Portianum Arch. 

 C. orbiculatum Balfs. 

 C. suborbiculare Wood. 

 G. Hammeri Beinsch. 



G. cruciatum Breb., forma minor, S. tricorne Breb. 



minor Wolle. 

 S. orbiculare Balfs. This was 



also seen with zygospores. 

 S, dejectum Breb. — Var. mucro- 



natum Balfs. 

 S. brevispina Breb. — Var. inerme 



Wille. 

 S. Dickiei Balfs. 

 S. brachiatum Balfs. 

 S. marga ritaceum Ehrenb. 



14 /x broad. 



Xanth 



X. fas 



This 



is 



typical as the figure given by 

 Cooke in his ' British Desmids ' 

 with six pairs of spines to each 

 semicell, but the spines not at 



S. alte?vians Breb. 

 S. arachne Balfs. 

 S. fasciculoides Wolle 

 5. pusillum Wolle. 

 S. gracile Balfs. 

 S. ranum Wolle. 



Wills 



all 



Wolfe 



as regards length, 



S. aciileatum Ehrenb. 

 lift 



which, moreover, has but four S. echinatum Breb. This was 



pairs of spines. 

 Euastrum oblongum Balfs. 

 E. ansatum Balfs. 

 E. didelta Balfs. 



Lund 



E. 



Nordstedtianum 

 minor Wolle. 



seen up to 36 /x broad. 



S. hirsutum Breb. 



S. Ravenellii Wood. 



S. eustephanum Balfs. 



udofi 



Wolle, var. S. furcatum Breb. 



E. binale Balfs, forma minor, 9 /x 



S. enorme Balfs. 



ON THE TWO VALEBIANS. 

 By W. H. Beeby, A.L.S. 



One of the points which have for some time attracted attention 

 in connection with Surrey Botany, is the relationship existing 

 between the two Valerians, Valeriana Mikanii and V. sambucifolia . 

 For a good number of years I have been accustomed to distinguish 

 the rare Mikanii of our chalk-hills from the common sambucifolia 

 without much difficulty ; but the opinions held by various botanists 

 in this country have been so diverse, that I was induced to enter 

 upon a series of experiments and observations in the hope of getting 

 at some definite conclusion. Before proceeding to give the result 



