S. 217 



Pent " in (Tetmemorus) liri'liixstmii Kill/.. Spiv. Al^. IM'.i, ]>. 1(17 (in p;n-l I. 

 :' 'I'l-hiifiitiu-ux yion'i.f'i/t'ji Dunn. Fiv-shw. Xlg. ED--. Lake Dislr. Issii, p. I;:, 



t, -2, L I'll: Cuoku, Urit, Duriiu. 1SSO, p. 50, t, 1U, f. U; t. l'(i, f. i' ; ! 



Toiii, Syll. Alg. 1889, p. 8G'J. 



(Vlls subcylindrical, 4-G (commonly 5) times longer 

 tlian their diameter, with a conspicuous median con- 

 striction; semicells very slightly attenuated from 

 base to apex; apices very broadly rounded, with a 

 deep median incision ; cell -wall minutely scrobiculate or 

 punctulate, punctulations arranged in distinct longi- 

 tudinal lines ; chloroplasts with a single median series 

 of four or five pyrenoids ; cells in side view more fusi- 

 form, semicells attenuated. 



Zygospore globose, with a thick smooth cell -wall. 



Length 155-220 /x ; breadth 80-41 /x ; breadth of 

 isthmus 22-32 /x ; cliam. zygosp. 80 ^. 



ENGLAND. Cumberland ! Westmoreland ! 

 \V. and N. Yorks ! Lancashire! Leicester 

 Warwick (Willy). Surrey! (Ralfn). Sussex (Ralfs). 

 Kent (llnlfa). Hants! (Ralfs). Devon! Cornwall! 

 (Ralfs). 



WALES. General ! (At 2,200 ft. on Glyder Fach, 

 and 2,700 ft. on Glyder Fawr, Carnarvonshire.) 



SCOTLAND. General ! (Roij $ Uissett). Outer 

 Hebrides ! Orkneys ! 



IRELAND. Donegal ! Mayo ! Galway ! Kerry ! 

 Dublin and Wicklow (Archer). Down! Londonderry ! 



Geor/r. Distribution. France. Belgium. Germany. 

 Austria and Galicia. Italy. Norway. Sweden. 

 Denmark. N. Russia. India. Australia (var.). New 

 Zealand. Azores. United States. Brazil. Guiana. 



This species is by 110 means common, and AVB never find it 

 in any quantity except in permanent bogs and at the margins 

 of lakes. It would appear that British specimens are larger 

 than those found in many parts of continental Kurope. 

 Halt's' measurements of his typical form were: length 215 /u, 

 breadth 36 fjt, agreeing very well with our own measurements; 

 whereas many continental observers give dimensions not 

 much more than half as large (length 78-116^; breadth 

 19-21 ^u). 



It is difficult to correctly place the form described by 



