Chlorochytrium porphyrae Setch. & N.L.Gardner

6 7 8 9 10 The New York
copyright reserved botanical Garden

Figure 1 is from Gardner, New Pac. Coast Mar. Alg. I, 1917 db 377-41«
pi. 32, fig. 6.	*	’ 11	’

UNIV. CALIF. PUBL. BOT. VOL. 8

[SETCHELL-GARDNER ] PLATE 15

PLATE 15

Chlorochytrium Porphyrae S. and G.

Fig. 1. A vertical section through, the host, showing plants of the endophyte
in various stages of development and of embedding. X 140.

NEW YORK BOTANICAL GARDEN

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3. Chlorochytrium Porphyrae S. and G.

Plate 15, fig. 1

Cells spherical, 40-60/i diam., embedded within the host on both
sides; chromatophore, single, at first small, covering the upper part
of the young plant, then increasing in size by sending out several
radiating arms and finally covering the cell wall; pyrenoid, single,
large, embedded within the chromatophore toward the upper part of
the cell; cell wall 2-3/* diam.', hyaline, not laminated; color, grass
green; sexual reproduction by 2-ciliated isogametes, 3^/x diam., fusi-
form to almost spherical, escaping singly through the oval opening
in the outer wall; asexual reproduction by zoospores and akinetes
unknown.

Growing completely embedded within the outer membrane of
Porphyra perforata f. segregata Setchell and Hus. Washington (Cape
Flattery) to central California (San Francisco).

Setchell and Gardner, in Gardner, New Pac. Coast Mar. Alg. I,

1917, pp. 379-384, pi. 32, f. 6; Collins, Holden and Setchell, Phyc.
Bor.-Amer. (Exsicc.), no. 2280.

This species was discovered at Lands End, San Francisco, Cali-
fornia, but since the first publication of its discovery it has been
observed in the vicinity of Cape Flattery, Washington, where it grows
in abundance on the same host as at San Francisco. It probably
extends along our coast wherever the host plant grows.

A full account of the morphology and development of this species,

as well as an extended discussion of the status of Chlorochytrium and
the various plants referred to C. Cohnn, will be found under the refer-
ence to Gardner given above.

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