413 



media parte caespitum) , nunc ascendentibus , basi curvato , vlx 

 inflato affixis. Vaginis tenuibus liyalinis, non lamellosis. Triclio- 

 matibus purpureis vel purpureo-violaceis , 3 ^ ad 5 ^« crassis, 

 apicibus saepius niodice incrassatis et ad genicula contractis. Arti- 

 calis diametro aecfvalibus usqve ad 3-plo brevioribus, dissepimentis 

 saepe indistinctis, protoplasmate granuloso; cellulis apicalibus i-otun- 

 datis, cellulis ceteris majoribus. Heterocystis parvis spliaericis vel 

 subspliaericis . basilaribus , singulis (rarissime paucis intercalaribus 

 in parte basilari trichomatis). Sporis non visis. 



Hab. in consortio CalotJtricis coiifervicolae in Fkco vesiculoso 

 et serruto in mari Kattegat ad insulam Laese niense januarii 

 (Rosenvinge). 



Of the species hitherto known tin's one is nearest to M.grisea; 

 only deviating from that other one in manner of growth, having sepa- 

 rated rows of small tussocks, and purple colour, smaller dimensions, 

 and the fdaments not swelled at the base or at least very little. In its 

 outer appearance it resembles Amphithrix Luminariae Kuckuck (Be- 

 merkungen z. marin. Algenvegetation von Helgoland 1S94) according to 

 the description of this species. 



90. Tolypothrix tenuis Kiitzing emend. 



Phycologia generalis, p. 228. 1843; Species Algarum, p. 313; 

 Tabulae phycologicae, II, p. 9. 



ToJupothrix tenuis Bornet cV Flahault. 



Revision des Nostocacees heterocyslees, fragment III. p. 122, 

 e specim. authent. in herb. Hafn. 



Tuhjpothrix lanata Wartmann. 



Rabenhorst. Algen, Nr. 768, 1858. 



Tolypothrix lanata Bornet iL" Flahault. 



Revision des Nostocacees heterocystees , fragment 111 , i>. 1 20, 

 e specim. authent. in herb. Hafn. 



T hallo densius vel laxius caespitoso-floccoso, rarius pannoso, 

 aerugineo aut demum luteo-fusco. Filis usqve ad 2 cm. longis, 

 7,2 fi ad 16,8/_/ crassis, saepius abundanter pseudo-ramosis, ramis 

 erecto — patentibus. Vaginis initio tenuibus hyalinis, aetate pro- 

 vecta crassis lamellosis. luteo-fuscis, baud raro ad basim ramorum 

 inflatis. Trichomatibus 5,0 fx ad 12,8 a crassis, aerugineis vel 

 olivaceis saepius ad genicula non contractis. Articulis ante divi- 

 sionem qvadratis usqve ad diametro duplo longioribus , protoplas- 

 mate granuloso farctis. Heterocystis cylindricis , subsphaericis vel 

 discoideis, singulis vel 1 — 5 seriatis, saepius hyalinis. 



It seems to me, that the distinction between T. lanata and T. 

 tenuis maintained by Bornet e^- Flahault is an impossible one. In 

 reading the descriptions of those two species in the Revision des 



