phycochromen.

1867 Q. Jrnl. Microsc. Sci. 7 209 The verdigris colouring matter of the Phycochromaceæ—namely, the Phycochrome of Nägeli—is a compound body, consisting of..chlorophyll..and of a blue matter to be called Cohn's phycocyan... In the living cells both colouring matters are intimately connected and form a mixed colour, phycochrom.

1874 M. C. Cooke Fungi 12 The green matter originally arises within the primary chlorophyll- or phycochrom-bearing cellule.

1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 273 Certain parasitic Ascomycetes penetrate them [certain Algæ]..and often form an intimate attachment with those..cells which contain phycochrome (as Plectospora, Omphalaria).

1889 Amer. Naturalist 23 2 These [lichen-forming] algae he [sc. Schwendener] divides into two classes, Phycochromaceae, or those with bluish-green coloring matter, phycochrome, and Chlorophyllaceae, or those containing chlorophyll.

1976 G. S. Björn & L. O. Björn in Physiologia Plantarum 36 297 As possible phylogenetic precursors, or at least analogues, of phytochrome, cyanophycean ‘phycochromes’ are of considerable interest.

1979 Proc. National Acad. Sci. U.S.A. 76 5655/1 Fractions extracted from a variety of algae contain photoconvertible pigments (P) such that exposure to red light induces a loss of absorbance in the red, often near 650 nm, and exposure to green light restores this absorbance... These pigments have received the generic name ‘phycochromes’, perhaps suggested by the photoconvertible phytochromes of higher plants.

1993 Chem. Rev. 93 800/2 Free α subunit..undergoes reversible photochromic changes that are indicative of phycochrome b, with difference maxima at 503 and 570 nm.

1881 Bull. Torrey Bot. Club 8 37 He questions the possibility of unicellular Phycochromes changing their generic character.

1888 Amer. Naturalist 22 671 The Phycochroms never reach as great a size as do members of each of the other sections.