. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . e latter is removed by exfoliation of the outer tissues and no permanentinfection takes place (Mann & Hutchinson, 07). Some species of the Trentepohliacese have become constituents of the thalli of certainLichens (vide p. 141). Wittrockiellaeese 311 The Trentepohliacese are a somewhat specialized family of the Ulo-trichales related to the Chsetophoraceae possibly through such forms asGongrosira in the Microthamniese. The simplest known type i

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. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . e latter is removed by exfoliation of the outer tissues and no permanentinfection takes place (Mann & Hutchinson, 07). Some species of the Trentepohliacese have become constituents of the thalli of certainLichens (vide p. 141). Wittrockiellaeese 311 The Trentepohliacese are a somewhat specialized family of the Ulo-trichales related to the Chsetophoraceae possibly through such forms asGongrosira in the Microthamniese. The simplest known type is Trentepohliaumbrina (Kiitz.) Bornet, but this is doubtless a reduced form. The transitionfrom Trentepohlia to Phycopeltis is seen in those species of Trentepohliabelonging to the section Heterothallus of Hariot, and from Phycopeltis toCephaleuros in the section Hansgirgia of the first-named genus. Family Wittrockiellacese. This family was established by Wille to include the genus Wittrockielladescribed by him in 1909. The thallus consists of erect and slightly branchedfilaments (fig. 204 A) embedded in a tough mucilage derived from the outer.

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