522 Physiologie. — Algae. 



Apres avoir analyse et ddcrit les propridt^s du suc ainsi obtenu 

 dans la premifere pdriode de developpement (6—7 jours) des graines, 

 et de celui obtenu dans la deuxieme p^riode (11 — 12 jours), l'auteur 

 montre que d'apres ses expdriences l'action du suc (de la ll«"® 

 Periode) est nuisible aux graines en repos aussi bien qu'aux graines 

 en germination: chez les graines au repos, le bain dans ce suc 

 diminue la facultd germinative, chez les graines en germination 

 l'arrosement avec le suc arr^te, pour ainsi dire, i'accroissement. 



L'auteur ne tire aucune conclusion de ces r^sultats, ayant 

 l'intention de reprendre bientöt ses expdriences. II se borne ä faire 

 ressortir que les sucs tirds des graines en germination sont des 

 poisons pour ces graines memes; ä ce sujet il rappelle que l'acide 

 carbonique lorsqu'il depasse certaines limites est un poison pour 

 les animaux qui pourtant le produisent constamment et en si grande 

 quantitd; il en est de meme de l'urde lorsqu'elle est injectöe dans le 

 sang; le phdnol qui est un produit de la putrefaction peut, dans 

 une certaine mesure l'empecher ä son commencement ; l'alcool, qui 

 se produit dans la fermentation alcoolique, lorsqu'il atteint une 

 certaine proportion, paralyse l'activitd des cellules du ferment et 

 arrete la fermentation. R. Pampanini. 



CoTTON, A. D., On some endophytic algae. (Journal of the 

 Linnean Society, London. Botany. Vol. XXXVIl. 1906. p. 288 

 —297. pl. 12.) 



The endophytic species dealt with in this paper are Endoderma 

 viride (Rke.) Lagerh. and two species of Streblonema, S. intestinum 

 Holmes and Batters and vS. Zanardinii De Toni. As regards Endo- 

 derma viride the material examined was growing abundantly in the 

 tissues of Nitopliyllum Hitliae, which was obtained by dredging. 

 The author finds that the appearance of the plant in Nitopliyllum is 

 somewhat different from that which it presents in Dcrbesia where it 

 was first discovered by Reinke: and though he believes that the 

 species is the same in both cases he distinguishes the plant he has 

 examined by naming it forma Nitophylli. The general appearance 

 of the thallus of E. viride is described, as well as the vegetative 

 filaments and the formation of zoospores. The germinating spore 

 puts out a germ tube which penetrates the young parts of the Nito- 

 pliyllum plant and when once an entrance has been gained Endo- 

 derma resumes once more its endophytic habit. There is no trace 

 whatever of external branches or hairs, and there is no evidence to 

 show that the plant is in any way parasitic. An alteration which is 

 probably purely mechanical takes place in the size and regularity 

 of the filaments of E. viride when passing over the patches of 

 antheridia of A^. Hitliae. Notes are made on the occurrence of 

 E. viride on other algae. 



Streblonema intestinum was first described by R e i n s c h under 

 the generic name of Entonema, but his description is so inadequate 

 that in the present paper a fresh diagnosis of the plant is drawn 

 up from Reinsch's own preparations preserved in the Kew 

 herbarium. It differs from 5. parasiticus by the larger sporangia 

 and by the apparent absence of external filaments. Of S. Zanardinii 

 the plurilocular sporangia are described and figured. Their general 

 form much resembles that of 6". intestinum. Forking occurs frequently. 

 Except for a few scattered hair-like filaments and the sporangia, the 

 growth of *S. Zanardinii is entirely endophytic. 



E. S. Gepp-Barton. 



