230 RECENT LITERATURE ON MARINK ALG.E. 



Heterospora by Kuckuck, is shown by Mr. Brebner to be distinct in 

 several points from the TilopteridaceiB, and he suggests placing it 

 either in a suborder of EctocarpacecB, HeterosporecB, or in a separate 

 order by itself, "as it differs from all the true Ectocarpacece in 

 having monospores." 



The removal of Choristocarpus tenellus from Tilopteridacece also 

 seems advisable to the author, and the order is thus reduced to the 

 two genera Tiloptens Kiitz., and Haplospora (Kjellm.) limit, mutat., 

 which have for species T. Mertensii Kiitz., H. globosa (Kjellm.) limit, 

 mutat., H. arctica Kjellm. ?, and H. Kingii Farlow ? The two latter 

 species are queried on account of their possible identity with 

 H. globosa. Five conditions of R. globosa are given with regard to 

 the reproductive organs: (1) Sporo-hermaphrodite ; (2) Herma- 

 phrodite; (3) Sporo-antheridic; (4) Sporo-oogonous; (5) Non- sexual; 

 the second and fifth of these conditions being most common. 



Although the actual process of fertilization has not been ob- 

 served, Mr. Brebner shows that this does not take place through a 

 cell-membrane, as "it is only the non-sexual spores that have the 

 sporangium invested by a wall, the ova being uni-nucleate naked 

 bodies." There is one plate, showing figures of Haplospora globosa 

 and Scaphospora speciosa, which abundantly justify the author's 

 conclusions. 



The first part of a memoir by M. Sauvaugeau entitled " Sur 

 quelques Myriouemacees " fills two numbers of vol. v. of the 

 Annales des Sciences Xaturelles, April, 1898. The date of the cover 

 is 1897, but to prevent possible mistakes the editor has inserted a 

 remark below, stating that the numbers were published in April, 

 1898. Discrepancies of this kind are, however, habitual to this 

 publication, and have already been pointed out in this Journal. 



M. Sauvageau deals firstly with the history of the various 

 genera and species of this group, one which is, perhaps, more 

 generally recognized as a suborder in Chordariace^e. The genus 

 Elachistea is here spelt accurately. Harvey cites it correctly in 

 Phi/cologia Britannica, but later in the Synopsis gives it as FJachista, 

 and in this he has been generally followed. The rest of the paper 

 is devoted to an exposition of M. Sauvageau's views on the morpho- 

 logy and classification of Myrionema and the allied genera. 



The first impression in glancing at this is one of utter con- 

 fusion. The author reduces the genus Myrionema to one species, 

 M. vulgare Thur., under which he places thirteen others from this 

 and other genera, — a welcome relief after the somewhat profuse 

 species-making indulged in by some botanists. But M. Sauvageau 

 then proceeds to make three new species of Myrionema, and two 

 new genera in MyrionemacecB, reserving, however, all diagnoses both 

 of genera and species for the second and still unpublished part of 

 his memoir. It is to be regretted that M. Sauvageau should have 

 decided to withhold these diagnoses, instead of publishing them 

 together with the first mention of the new names. 



The new species of Myrionema are M. polycladnm, which was 

 found at Gijon, growing on the thallus of Fucus serratus near the 



