104S 



are formed ;" their evolution, however, proceeds no further, and they 

 decompose like the antherozoids. When the spores and antherozoids 

 are mixed together, germination soon commences, and proceeds 

 rapidly. " If the experiment has been performed on a slip of glass 

 kept constantly near a window, in the same position," nearly all the 

 radicles turn away from the light, and towards the interior of the 

 room. When the antherozoids are in considerable quantity, they are 

 seen to " attach themselves to the spores, crawl in a manner upon 

 their surface, and couununicate to them, by means of their vibratile 

 cilia, a rotatory movement which is often very rapid. Nothing is 

 more curious than the appearance of these large brownish spheres 

 [the spores] rolling in all directions among the crowd of antherozoids 

 which surround them." The author failed in his endeavours to fecun- 

 date the spores of Ozothallia vulgaris (Fucus nodosus, Linn) with the 

 antherozoids of Fucus serratus and F. vesiculosus, and vice versa ; 

 nor was he more successful when he applied the antherozoids of 

 Fucus vesiculosus to the spores of F. serratus ; but on reversing the 

 latter experiment, he found that some of the spores of F. vesiculosus 

 germinated. He does not l^owever venture to conclude from this that 

 hybrid fecundation is possible, but mentions it to call attention to the 

 fact, that whilst " the Ozothallia and Fucus serratus are very constant 

 in form, F. vesiculosus is extremely polymorphous." 



No. 68 contains no botanical paper. 



Contributions towards the Geographical History of the Plants of 

 Upper Teesdale. By John G. Baker, Esq. 



During a recent visit to Teesdale, 1 have procured numerous notes 

 respecting its botanical productions, and their localities ; but these 

 have been so frequently examined, and recorded in detail, that, with 

 some few exceptions, it will only be desirable to reproduce here those 

 portions of my observations which relate to the geographical area 

 embraced by the rarer species, or extend the limits previously ascer- 

 tained in this country for those of more general occurrence.* 



* The estimates of altitude, in leaps of fifty yards, are based upon the barometnc 

 measurements of Professor Phillips, as reported in his new work, ' The Rivers, Moun- 

 tains, and Seaeoust of Yorkshire.' The temperature is calculated according to the 

 rule of Dalton, as in the ' Cybcle Britaunica ;' assuming the isotherm of 48 degrees 

 for that of tlie coast-level, and deducting one degree of mean annual temperature for 



