. Dansk botanisk arkiv. Plants; Plants -- Denmark. 142 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. The cells of this inferior part are filled with grams of starch, yet they will die or dissolve little by little; it may also be that the rhizines get some nourishment out of them. In sections I have often seen three layers of thalli one above another. By these superposed thalh P. Nordstedtii approaches the group of P. polystrata of which P. dura Heydr. is the type. The name dura, given on account of the hard calcified nature of the frond, is alone sufficient to show that our alga with its soft frond, is
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 142 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. The cells of this inferior part are filled with grams of starch, yet they will die or dissolve little by little; it may also be that the rhizines get some nourishment out of them. In sections I have often seen three layers of thalli one above another. By these superposed thalh P. Nordstedtii approaches the group of P. polystrata of which P. dura Heydr. is the type. The name dura, given on account of the hard calcified nature of the frond, is alone sufficient to show that our alga with its soft frond, is a different species, not to speak of other differences, afforded by the peculiar structure of the nemathecium of P. dura. I have seen only one nemathecium of P. Nordstedtii with cruciate tetraspores, but it was still unripe. It had a height of 80^, and the paraphyses ended with a blunt cell; the cells were 1^/2—2 as long as broad but this will change with succeed- ing growth. P. Nordstedtii ad- heres totally and firmly to the sub- stratum. I cannot say anything about its colour for it was preserved in alcohol and I have seen no dry specimens from the W. Indies. The specimen from Nias that has so much in common with the W. Indian one, has a pale pink colour. Found at St. Jan off Cruz Bay in a depth of about 12 fathoms. In alcohol. (No. 1903).. Fig. 147. Peijssonnelia Nordstedtii nov. spec. Sec- tion through part of nemathecium with cruciate tetraspores. (250 :1). Subgenus 2. Eitpeyssofifielia. 5. Peyssonnelia (Eupcyssonnelia) simulans nov. spec. Thallus tenuis, orbicularis aut irregularis, substrato tomento brevi adhærens sed facile a substrato solutus, durus, calcarius, zonas concentricas et lineas radiales vix conspicuas exhibens, con- stans hypothallo et perithallo. Hypothallus constat fills rectis, juxtappositis, cellula apicali brevi, lata instructis. Cellula apicalis in sectione radiali altior fibs Please note that these images are extracted from scanned pa
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