Nr. 1] SUBAKRIAL ALGAE FROM SOUTH AFRICA 23 



divisions in two directions. The species also occurs as licben- 

 ganidia. 



To judge from the samples oxamined, this species is one of Ihe 

 iiiiost frcquent subacrial algae on trunks of trees in South Africa. I 

 have found it in a great number of samples from Durban as well 

 as from Saldanha Bav (nos. 8, 12, 20. 26, 58, 61, 65, 68, 77, 81, 82, 83, 

 85, 87, 99, 267, 272, 328, 333, 339, 341, 356, and 368). 



Physolinum nov. gen. 



Thallus ex f'iUs irregulariter ramosis, e celluUs elliptice vel ouate 

 inflatis, uniseriatis formatis, constat. Cellulae novae adulteriori- 

 hus apice vel ledere papillorum instar tumefactis oriuntur. 

 Chromatophoriim taeniaeforme, ex filo unico-pluribus parietali- 

 bus, margine incisis vel rnmosis, pyrenoidibiis nullis constat. 

 Amylum deest. Propagatio aplnnosporis globosis-elUpticis numero 

 majore in aplnnosporangiis snbsphaericis ortis, quae e cellulis 

 vegetativis intercalnribus vel apicalibus oriuntur, cellulis vegeta- 

 fivis saepius majoribus. Algae aéris. 



Physolinum monile (Dii Wildem.) Printz nov. comb. I PI. 

 XIII, Fig. 306^3121. 



Trentepohlia Monilia De Wildeman in Bulletin de la Société 

 de Botanique de Belgique T. XXVII; Annales du Jardin Botanique 

 deBuitenzorg,T. IX, 18S<S, p. 181. Tr. moniliformis Karsten, Unters. 

 Fam. Chroolepideen, Ajinales du Jardin Botanique de Buitenzorg, 

 T. X. p. 11; De Wildeman, Notes zur quelques espéces du 

 genre Trentepohlia in Annales Société beige microscop. 1894, p. 10. 



Thallo vakle ramoso, trunco et ramis conformibus. Cellulis 

 ovatis, inj'latis, 9,5 — 28 jli latis et usque ad 43 </ longis, ad parietes 

 transversarios constrictis, 4 — 10 jn latis. Membrana tenuissima, levi. 

 Chromatophoro ex filo unico-pluribus angustiusculis, ramosis con- 

 stante, totum parietem inieriorem non obtegente. Aplanosporangiis 

 subsphaericis, vulgo cellulis vegetativis aliquanto majoribus, 4 — 16 

 aplanosporas globosas-elUpticas continentibus, pariete aplano- 

 ."^porangii dirupto liberis. 



Habitat regionibus calidis in cortice arborum plerumque cum 

 muscis et hepaticis. 



This alga, which was originally described by De Wildeman, 

 under the name of Trentepohlia monile, and later on by Karsten, 

 as Tr. moniliformis, is ratlier common in some of the Siamples 

 examined. Till now the reproduction of this alga has becn unknown, 

 and its systematical position, accordingly, undecided. In the repro- 

 duction by aplanospores this plant appears so widely differing from 

 Trentepohlia and from the Trentepohliaceae on the wholie, Ihat I 

 have found il right to separate the species in question as a 

 new genus. Probably it even represents an entirely new familj'', as 



