Chondrus divaricatus Grev.

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Callophyllis divaricata (Grev.) Howe & Taylor, comb. nov.

Chondrus divaricatus Grev. St. Hil. Voy. Dist. Diam. Brésil 2: 448. 1833.1

SpJiaerococcus divaricatus Mont. Ann. Sci. Nat. Bot. II, 12: 43. 1839.

Frondibus 4—7 cm. altis, caespitosis, intricatis, complanatis, sub-
cartilagineis, 0.2-0.5 mm. crassis (specimine originali indurato-sicco
madefacto) repetito subdichotomis, segmentis 1-4 mm. latis, plus
minus ve divaricatis, oblongis vel linearibus, interdum lobatis, obtusis.

Playe près Aldea Velha,” Province of Espiritu Santo, Brazil,
Voyage of Auguste de Saint-Hilaire, 1816 to 1821. The original

1 The algae described as new in the place cited, under names given by Greville,
appeared also under nomina nuda in a review of the work published the same year
by St. Hilaire (Archives de Botanique 2: 448-450. 1833).

Brittonia

1931

specimen2 (fig. 2) is well preserved in the Greville Herbarium in the
Royal Botanic Garden of Edinburgh. It shows immature tetra-
sporangia scattered in the cortex. There is a smaller, more densely
caespitose cotype in the Herbarium of the Museum d’Histoire Natur-

elle of Paris, bearing a tag inscribed 1060 S. We do not venture to
describe color from specimens that have been dried for more than a
hundred years. The species was apparently not collected by the
Hassler Expedition and it appears to be known only from the original
specimens.

2 Probably collected in 1818. The date 1832, borne by most of the St. Hilaire
specimens in the Greville Herbarium, appears to be the date of Greville's receipt
of the specimens from St. Hilaire.

H ERBARIUM OF The N ew York Botanical Garden

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Fig. 2. The type specimen of Chondrus divaricatus Grev., from near Aldea
Velha, Brazil, natural size. Its microscopic structure indicates its reference to
the genus Callophyllis.

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