129 



as broad or isodiametric ; towards the periphery the cells are, as 

 a rule, as high as broad or a little less. Seen from above the 

 peripheral cells have a diameter of d= 20^. The cells of C. Peys- 

 sonnelixjormis have a breadth of 20 12^ at the base, lessening 

 upwards to 8 and to 5 p at the top ; they are from l x / 2 to 4 times 

 as high as broad. 



The vertical rows of cells of C. Magdse loosen themselves 

 from each other under very slight pressure after decalcification 

 and only their basal cells remain fastened together. This will, 

 probably be in consequence of the 

 disappearance of the carbonate of 

 lime. There are lateral pores be- 

 tween the cellrows, but the pores 

 are very delicate and do not tend 

 to make the frond much firmer. 

 C. Peyssonneli&fortnis has no carbo- 

 nate of lime between its cellrows, 

 which do not loosen themselves from 

 each other under slight pressure ; 

 the frond is soft and fleshy to the 

 touch after having been moistened. 



The tetraspores of C. Magdae 

 are born in sori at the top of the 

 vertical cell-rows (Fig. 137); they 

 divide in a cruciate way, but the 

 divisions are often irregular and 

 sporangia with two and three spores 

 only, are not rare. They are covered 

 by a pretty firm cuticula, that seems 

 to tear off at maturity of the spores. 

 The sporangia have a height of 36 40 

 1620 . 



Fig. 137. Contarinia Magdse 

 n. sp. a. section through vege- 

 tative part of thallus in full 

 growth, with the cells in the 

 higher part dividing repeatedly. 

 b. section through part of a 

 soruswith tetrasporangia at the 

 top of the filaments. (120:1). 



and a breadth of 



Found in the "Sound" between St.[ Thomas and St. Jan by Dr. 



MORTENSEN. 



Fam. 3. Squamariacece. 



By M me A. WEBER-VAN BOSSE. 



When treating of the Squamariaceae. of the "Sealark" expedition, 

 I divided the Peyssonnelia into three subgenera: 1. Peyssonndia 

 s. s. or Eupeyssonnelia with a hypothallus consisting in the main 

 of straight filaments, running close to one another in a horizontal 



9 



