26 Vol. XLIII., Art. 1.— K. Yendo: 



In " non-ciyptostoraated " members we often find minnte dark 

 brownisli spots in the upper portion of the frond. They very 

 nmch resemble, in mode of occurrence as well as in anatomical 

 characters, the scars of the withered hair-tufts. In some cases 

 they are results of an accidental death of epidermal cells, the 

 space being filled up by quick multiplication of the surrounding 

 cells which continues as long as the part concerned extends as the 

 blade develops. In others, they are remains of the mucilage 

 glands, as stated below. While the frond is yet young, the nature 

 of such elliptical spots may be ascertained by the presence or 

 absence of the hair-tufts in other parts of the frond. But in a 

 matured and old frond in which no more functionate hairs are to 

 be found, we are often puzzled to determine whether the plant is 

 " cryptostomated " or " non-cryptostomated." This is especially 

 the case in the dried herbarium specimens. 



From the above statements it may be readily granted that 

 the presence or absence of the hair-tufts is often difiicult to as- 

 certain in an old fragmentary specimen ; and also that the length 

 or number of the hairs in a tuft is variable and hence of no 

 specific importance. Yet when we are able to collect a large 

 number of specimens of a certain species it is always advisable 

 to make a careful observation of them. In some cases, we find a 

 few hair- tufts in the frond of a species which is properly " non- 

 cryptostomated " in the typical form. Cfr. description of A. prce- 

 longa, p. 85. 



Mucilage Glands* 



The presence of the peculiar glandular cells in fronds of Lami- 

 nar i a Peter seniana Kjellm. was first noted by Okamuea^) who took 



1) Okamup.a. : On Laminaria of Japan, p. 98. 



