201 



practice and he proposed three groups. His classification ougtht 

 now to be essentially modified after the examination of M'"*^ Weber. 



Referring for detail to the paper itself I shall only here 

 mention what has a special interest concerning the West Indian 

 species. Thus it is pointed out that J. Agardh has been wrong 

 in referring Padina gymnospora, P. Antillarum and P. variegata 

 to P. Durvillaei and that Hauck also has been mistaken when 

 he refers P. gymnospora Kiitz., distributed in the exsiccata of 

 HoHENACKER (no 515) to Padina Commersonii. To be sure 

 M^'^ViCKERS had even in 1905 Padina gymnospora and P. variegata 

 in her "Liste des Algues marines de la Barbade" but she gives 

 no reasons for taking up these species. Of course it is most 

 probable that she has got some information from Dr. Bornet. 



The West Indian forms collected by me I have referred to 

 the two species of Kutzing : P. gymnospora and P. variegata and 

 further to a new species. 



1. Padina Sanctse Criicis nov. spec. 



Frons membranacea, 10 — 15 cm alta, pluries subfissa, seg- 

 ments terminalibus flabellatis, duobus cellularum stratis composita, 

 rhizoideis numerosissimis e parte basali angustiore ortis adtixa. 

 Pili in zonas concentrales ordinati, sori tetrasporangiorum supra 

 alternas series pilorum concentrice distributi sunt. 



As pointed out in the diagnosis this species is characterized 

 by having a distromatic thallus through its whole length (comp. 

 Fig. 153 b, c, e), by the di- 



stribution of the tetraspor- ,.<cf^ii|||f§!% 0mmmrirj^^ 



angia, the latter occurring . ^> 'V^""; "',17 '''''^' > -■>'^'*^^ 

 in broad series along the ji^r?'^ .-'■';7>'''"**'*^*^ ^^-^^ 

 upper side of every second 



row of hairs (Fig. 154) and "^^V'i^^l^'^^-' '-V'^'' ""'^^ 



by the presence oi a well- ^^'" -.-'■-'^' '^f-^,. 



developed indusium covering ^ . . ;:^^,^,ew?fc.is^ ' -/' ' 



the tetrasporangia-sori (Fig. ^^^ - "-^^^^ 

 153 d, e). 



The plant reaches a 

 height of about 10 — 15 cms 



and is somewhat incrusted Fig- I5f- f/^^(!"« *^''- ^'''""'^ "o^- ^P^^. 



.11 Part of the thallus seen from above show- 



with chalk upon the lower ing the mutual arrangement of the series 



surface, hence the dried of hairs and tetrasporangia. 



, ' , 1 •.• , (About lM-2 : 1). 

 plant has here a whitish 



colour with dark brown rings, while the upper side is yellow^ 



brown with darker rings. 



