i034 Conjugatse, Desmidiaceae, Cosmarium. 



Ilab. iii stagnis iii Hiberiiia (Archer). 



231. Cosmarium platyisthmum Archer in Journ. Dubl. Micr. Club IV, 2408 

 1880-85, p. 27, Cooke Brit. Desm. p. 187.— Minutura, isthmo la- 

 tissimo, pro ratione longo ; semicellulis ellipticis, multo magis latis 

 quam altis, levibus; e vertice visis elongato-compressis, apicibus 

 rotundatis; marginibus superioribus medio conspicue retusis. 



Hab. in Hibernia (Archer). 



232. Cosmarium binoduium Reinsch Contrib. Alg. Fung. p. 83, t. 18, 24fio 

 f. 5. — Semicellulis ovato-semiellipticis, in inferiore parte se ad- 

 tingentibus, margine terminali truncato nodulis binis (verrucis) in- 

 structo. marginibus lateralibus undulatis; a vertice conspectis el- 

 lipticis, nodulis bini; juxta diametrum transversalera positis in- 

 structis. 



Ilab. in Franconia Germanire (P. F. Reinsch). — Dimens. 36 ^ 

 28. CellulaB indumento hyalino striato velata^. Ex Nordst. in Hedwi- 

 gia 1876, p. 65 idem ac Cosmarmm isthmochondrum Nordst. 

 esse videtur. 



** Membrana verrucis obsita, rarius tantum grosse punctata. 



233. Cosmarium splialerosticlium Nerdst. in Wittr. et Nordst. Desra. 2470 

 Ital. tyrol. pag. 29, t. 12, f. 3 et in Hedwigia 1877, p. 171. — 

 Parvura, paullo longius quam latius, profunde constrictum, sinu 

 angusto lineari; semicellulis subreniforrai-trapezicis, basi recta, 

 aogulis inferioribus subrectis, medio dorso late truncatis et nudis, 

 granulatis, granulis in medio semicellularum saepe in series (2-3) 

 verticales regulariter ordinatis, ceteris saepe inconstanter disposi- 

 tis; a vertice visis ellipticis, margine subtiliter granulatis (gra- 

 nulis 1-3 medio, utrinque saepe paullo majoribus v. magis visibilibus); 



a latere conspectis circularibus, granulatis; latitudine isthmi fere 

 trientem, lat. apicis circiter dimidium diaraetri transversalis cor- 

 poris, crassitudine duas partes longitudinis cellula^; pyrenoidi- 

 bus .... (?); zygotis globosis v. subglobosis, piceis, glabris. 



Hab. in rupibus huraidis inter « Stresa et Baveno» in Italia. 

 — Cosmario orthosiicho Lund. et Cosm. pseudomargaritifero 

 Reinsch proximura, differt iraprimis apicibus cellulae truncatis, an- 

 gulis inferioribus semicellularum subrectis non rotundatis, tantum 

 nonnullis granulis regulariter dispositis; zygota C. orthostichi 

 ignota sunt. A C. punclulato facile differt zygotis, qune in C. pun- 

 clulato teste Lund. Desm. Suec. p. 30 verrucis apice 3-4-fidis ob- 



