46 



Dansk Botanisk Arkiv, Bd. 3. Nr. 1. 



Fig. 43. Acro- 

 chætium occi- 

 dentale nov. 

 spec. Branch 

 with sporan- 

 gia, the upper- 

 most divided 

 into two spo- 

 res. (About 

 400: 1). 



(Vickers) is the same as this species. But the descrip- 

 tion of M^i^ Vickers is so defective that any identifica- 

 tion by help of it is impossible and as: "Les échan- 

 tillons, mal conserves, ne se pretent pas bien å 

 rétude", any help from the original material seems 

 also excluded. 



The bases of the two plants in question are 

 apparently alike and they are both living upon 

 Liagora. Bornet and M^^^ Vickers refer the plant 

 to Chantransia which suggests that the plant from 

 Barbados had sexual organs ; these I have never 

 found in my plant. As to the arrangement of the 

 monospores of Acr. Barbadense, their form and size 

 nothing is said just as no description is given of 

 the sexual organs. 



St. Croix: Long Point. 



15. Acrochætium comptum nov. spec. 



Thallus usque ad 1 mm altus et ultra, 

 e filis erectis ramosis sporangiferis et fills 

 endophyticis compositus. 



Spora in filamentis assimilatoricis hos- 

 pitis germinans, magna, oblonga, in cellu- 

 las duas divisa est ; e cellula inferiori 

 fila decumbentia circa filamenta hospitis 

 repentia, e cellula superiori filum singulum 

 erectum gignitur. 



Filum erectum inferne nudum, superne 

 ramosum ramis vicissim plus minus ramo- 

 sis ramos seriates gerentibus instructum. 



Cellulæ cylindricæ 8 — 11 fi latæ, ca. 

 35 ju longæ, chromatophoro parietale pyre- 

 noide laterali instructæ. 



Sporangia monospora, plerumque ses- 



silia, nonnumquam in ramuhs unicellu- 



laribus posita, singula vel bina, in parte 



basali ramorum uniseriata, ovata, 11 — 14 /i 



lata et ISn longa. 



This species is characterized by the ^ig. 44. Acrochætium 

 „ , j^, ^ j^i . ,. •,•'•,! compzum nov. spec. Basal 



iact that the germmatmg spore is divided part of a plant showing 



by a transverse wall into two cells from the original spore divided 

 .1 i> 1 • 1 J m . into two cells. (About 



the upper oi which an erect filament 350 . i)_ 



