. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Borgesen: Phæophyceæ of the Danish W. Indies. 45 practice and he proposed three groups. His classification ougtht now to be essentially modified after the examination of Mme 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. Antillariim and P. variegata to P. Durvillaei and that Hauck also has been mistaken when he refers P. gymnospora Kütz., distributed in the exsicca
. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Borgesen: Phæophyceæ of the Danish W. Indies. 45 practice and he proposed three groups. His classification ougtht now to be essentially modified after the examination of Mme 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. Antillariim and P. variegata to P. Durvillaei and that Hauck also has been mistaken when he refers P. gymnospora Kütz., distributed in the exsiccata of Hohenacker (no 515) to Padina Commersonii. To be sure Mlle Vickers had even in 1905 Padina gymnospora and P. variegata in her "Liste des Algues marines de la Barbade1' 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 Kützing : P. gymnospora and P. variegata and further to a new species. 1. Padina Sauctae Crucis 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 adfixa. 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. 21 b, c, e), by the di- stribution of the tetraspor- angia, the latter occurring in broad series along the upper side of every second row of hairs (Fig. 28) and by the presence of a well- developed indusium covering the tetrasporangia-sori (Fig. 27 d, e). The plant reaches a height of about 10—15 cms and is somewhat incrusted „ F'g- ,28- Padina St. Crucis nov. spec. Part of the thallus seen from above show- with chalk upon the lower jng the mutual
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