CHOBDUt] L< i:.v.. 17 



XXXI. MYBJONEM \. 



66. strane;ulans < 7V/r choking Myrionema) j patches i 

 confluent, brown j the vertical filaments clavate, densely Bel : 

 spore- obovate, on Bhorl Btalks, attached to the decumbenj 

 filaments, Grev. Orypt.Fl. *. 300. A.TLAS, PL XVI. Fig. 



Hab. Probably widely dispersed. Parasitical on the fronds of 



various Ulvct and Enteromorphce. Annual. Summer and 



autumn. 



.1/. strangulans abounds on all our coasts, and w ill always 



afford the | a microscope an interesting subject 



for examination. The dark-brown Bpecks on the nronds of 



omorphcB and Ulva, which Iooe like incipient decay. 



are very often caused by the growth of our parasite, and 



their colour will direct the mosl uiexamining eye to them. 



I have generally found the plant in a perfect state in 



summer and autumn, but specimens may he found at most 



- '113. 



67. Leclancherii {Leclancher's Myrionema) ; patches orbicular, 

 thin, and with few vertical filaments toward the i 

 convex with crowded filaments in the centre: Bporeson Iiuil: 

 pedicels affixed to the decumbent filaments, obovate, Ji 

 Ph>i. Brit. pi. 11 a. (Atlas, PL XVI. Pig. 69.) 



Bivularia Leclancherii, Chauv. 



Ifab. On decaying fronds of Hhodymenia palmata^ probably com- 

 mon. Annual. Autumn. 

 Iii autumn the fronds of the common Dulse (Rhody- 

 ■ palmata) in passing to decay are commonly found 

 covered with roundish olive spots, which, by a hasty ob- 

 server may be overlooked as being nothing more than 

 incipient mortification. By placing a small portion iA' such 

 a spotted frond under the microscope, the beautiful parasite 

 her.' figured is brought to light. It is nearly related in 

 structure to M. strangulans, but differs something inhabit, 

 forming a much larger and thinner spot on the fucus. 



68. punctiforme | The dot-like M : pat die- globose ; 



filaments tapering to the base ; Bpores linear-obovate, af- 

 fixed to the vertical filaments near their base, Han, in Hook, 

 Br, Fi. >: 2, p. 391. I Vila-, PL XVI. Fig. 70.) 

 Linkia punctiformis, Lyngb. 



Jl'ifj. Shores of Europe. Parasitical on the Floridea, Annual. 

 Bummer and aut umn. 

 This little parasite is obviously nearly akin to the pre- 

 ceding, from which i; fronds or patches and more 



