102 FERNS COLLECTED IN NORTH FORMOSA BY MR. WM. HANCOCK. 



As regards continuity the agreement is as close as in other 

 respects. Under the influence of contracting reagents the proto- 

 plasm of the cells leaves the side walls, but it clings most 

 tenaciously to the ends. By the employment of the methods 

 already detailed, however, the tissues may be sufficiently swollen 

 and clarified to allow the connection between contiguous cells to be 

 definitely determined. When this is done, it is found that the 

 cells of the central filaments have their protoplasts united, the 

 union being efi'ected either through open pores at the ends, or, in- 

 directly, through the intervention of one of the sieve-plate 

 arrangements described under AscoplujJlum. Continuity is also 

 maintained in the layers of cortical cells, as well as in the fibres, 

 which arise from them and curve inwards to interlace with the 

 central filaments. In a word, all that has been said respecting 

 continuity in the previous paragraphs may be applied without 

 error to the two species of Fucus now under consideration, and 

 need not therefore be repeated. 



Explanation of Plate 255. — Ascophyllum nodosinn. Fig. 1. Longitudinal 

 section througli a jDortion of the thallus, — emidiagrammatic. 2. Portion of 

 central tissue after treatment with sulphuric acid and ammonia. 3. Filament 

 from central tissue, showing the protoplasm continuous througli an open pore. 

 4. Ditto, showing the annular thickening in section. 5. Ditto, showing con- 

 tinuity' by means of a sieve plate. 6. Ditto, by means of a slit. 7. Ditto, 

 by means of a fine pore. 8. Fibres from the central tissue. 



PEENS COLLECTED IN NOKTH FOKMOSA BY 

 ME. WILLIAM HANCOCK. 



By J. G. Baker, F.E.S. 



The following is a list of the ferns contained in a collection 

 which was made in 1881, by Mr. William Hancock, in the neigh- 

 bourhood of Tamsui, at the northern extremity of the Island of 

 Formosa. Mr. Oldham and Prof. Steere have previously made 

 collections in the same district; but Mr. Hancock has both dis- 

 covered several interesting new species and gathered several others 

 not collected in the Island previously. The numbers are Mr. 

 Hancock's collecting numbers, and those within brackets indicate 

 the position of the novelties according to the sequence followed in 

 ' Synopsis Filicum.' 



61. Glekhenia hmf/mima Blume. 

 75. G. dichotoma Hook. 



62. AlsopJii/a ^ — Probably a new tree-fern, but not in fruit. In 

 cutting and texture it closely resembles AlsophUa lunuhita. The 

 rachis of the pinna) is muricatea throughout with raised points. 



55. (48=:=). Alsophila denticulata, n. sp. — Stipe abottt a foot 

 long, bright brown, clothed towards the base with abundant bright 

 brown lanceolate paleae. Frond moderately firm in texttire, green 

 on both surfaces, densely hairy on the ribs above, glabrous, but 



