SOME NEW ALGÆ FROM JAPAN. 



Benzciitenici 1 yenoshimensis, Gen. et sp. nov. 



(Plate XIV. Figs. 1-12.) 



Fronde parasitica, partibus vegetativis intra contextual 

 plantœ hospitœ penetrantibus, fructibus aut sexualibus aut 

 asexualibus compacte aggregatis, verrucam tuberculosam al- 

 bidam formantibus; cystocarpiis globosis subsessilis apicibus 

 rotundatis, pericarpiis cellulosis, placenta cellulis majusculis 

 rotundatis contexta, gonimotobis numerosis, fasciculato- 

 corymbose ramosis, carposporis longe clavatis albidis; Sti- 

 chidiis elongato-conicis sessilibus enermibus, axe monosiphono, 

 intra articulos tetrasporangia hyalina triangule divisa ver- 

 ticillata gerentibus; antheridiis elongato-conicis, sessilibus 

 enermibus axe monosiphono, spermatiis numerosissimis circa 

 axem stratum continuum periphericum formantibus. 



Habit. In frondibus Chondriœ crassicaulis et Laurenciœ 

 paniculatœ ad littora Japoniœ. 



This interesting parasitic alga was first found by my- 

 self at Yenoshima near Tokyo Bay, Japan, in 1903. Several 

 years later I found it again at Oshoro, near Otaru, on the coast 

 of the Sea of Japan. In both cases the host was Chondria 

 crassicaulis. One more collection has been made on Yageshiri 

 Island, a small islet in the north of Otaru Bay. The host was 

 in this case Laurencia paniculata. 



The vegetative organs of the plant are reduced to a mere 

 aggregation of cells. While the parasite is still young, these cells 

 are imbedded in the parenchymatous tissue of the host without 

 any perceptible order in their arrangement. They are hardly 

 discernible from the cells belonging to the host, being similar 

 both in shape and size. Hæmatoxylin dyes, however, stain the 

 former a deep purple, while the latter remain a pale violet 

 colour. 



1 After a water-side goddess of Hindoo origin; a temple to the goddess 

 stands on the peninsula of Yenoshima. 



