KO 



NGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 25. N:<> 5. 97 



20. M. Americana (Ehr.) Ralfs (Br. Desra. p. XIX, in »errata». (M. morsa) p. 74, t. X, 

 f. 1; Kötz Sp. Alg. No. 5, 171; Euastrum Americanum Ehrb. Verbr. A mer. p. 125, 

 t. IV, f. 15; Euastrum (No. 4) Bailey, Amer. Bacill, p. 295, t. I, f. 25, cfr Ehrb. 1. 

 c. p. 46!; M. Americana (formae vari») Maskell, 1. c. f. 1 — 6, non 7 — 14). 



Forma ut in var. a (typica) Ralfs 1. c, sed minor; membrana obscure punctata. 

 Long. 100—118, lat, 86—92, lat, isth. 18—20, lat. apic. 50—54, lat, bas. lob. 

 pol. 22—27 /u. 



Northern India, J. 8. 



21. M. anomala Turner (in litt. 1883; M. apiculata forma Joshua? Burm. Desm. p. 630, 

 t. XXII, f. \% = idem f. Joshua, De Toni et Levi, Notarisia p. 91, 1886). 



M. magna, egregia, anomala, circ. quarta parte longior quam lata, late elliptica, 

 sinu profundo, lineari, angusto; semicellula' quinquelobae, lobis lateralibus bi-lobulatis, 

 snb-radiantibus, incisurte interne plus minus acuto-rotundata\ apicibus lobulorum 2- 

 3 — 4-dentatis; marginem versus utroque latere processubns duobus, et circa ventrem 

 semicellula- processubns 4, brevibus, tubiformibus dentatis armatis, scrobiculum mag- 

 num vel processum cingentibus; lobo polari exserto, cuneato, apice incavato, angulis 

 in 4 — 6 processus divergentes tubiformes dentatos fissis, basi processubns duobus consi- 

 milibus brevibus, munito. Membrana punctata? A latere visa modice constricta, semi- 

 cellulis lanceolato-attenuatis, apice rotundatis; processubus prominentibus. 



Var. irregularis. F. lobis lateralibus irregulariter divisis; quoque in 3 — 4 — 5 

 lobulis secto. 



Long. 190—210, lat, 145—160, lat. isth. 37—42, lat. apic. 74—90, lat. bas. 

 lob. pol. 34—40, crass. circ. 54 /u. T. XXII, f. 1. 



Hab. Kiiasia, super Brahmaputra flumen, ex Utricitlariis ; also E. India, ex 

 Utricularia. fasciculata, G. v. L. 1889; Northern India, 1883, J. 8. 



This is a verv anomalous aud extraordinary plant, of which I have seen but 5 

 specimens, the variety of which in the divisions of the lateral and the angles of the 

 polar lobes is astonishing. It seems as though the frond was in general outline nearest 

 to M. Auwrii-ana, with the lobules and projections (tubular!) of Xanthidium armåtum 

 superadded! However, this species stånds alone, being much unlike any other member 

 of the genus. The specimen I had in 1SS3 was onlv part of decayed semicell, so I 

 could not describe it. The nearest approach to this Desmid is the M. apiculata forma 

 (f. Joshues De Toni) of Joshua in his Burm. Desm. p. 636, t. XXII, f. 13, which al- 

 most seems to be an erratic form of this plant. 



22. M. Khasiae, n. sp. M. mediocris, diametro paiillo longior, medio inodice constricta, 

 sinu lineari; semicellulis 5-lobatis, lobis sinn lineari inter se discretis, lobo polari lato 

 brevi apice incavato valde expanso non exserto spinis brevibus curvatis crassis armato; 

 lobnli laterates non asquilati, superioribus latioribus quam inferioribus et basalibus, api- 

 cibus bisectis acutis, apicibus lobulorum 2 basalium et 2 superiorum aculeis parvis 

 munitis; membrana glabra? sed cum papillis parvis conicis sparsis paucis brevibus apice 

 rotundatis ornata, 8pecies, ut mihi visa, inter M. apiculata Ehk. et M. mammillata 

 Xob. (On Desm. p. 936, t. XVI, f. 12, reduced!), sed multo minor, et non aeque gra- 



K. Sv. Vet. Akad. Handl. Band 25. N:o f). 13 



