Streblonema rugosum Setch. & N.L.Gardner

• Region

  North America

• Country

  United States of America

• State/Province

  Washington

• County/Municipio

  San Juan Co.

• Locality

  San Juan Island

• Coordinates

  48.5411, -123.085

• Georeferencing Method

  Other source.

• Distribution

  Map all specimens of this taxon

Streblonema rugosum Setcheli & Gardner, sp. nov.
Univ.Calif.Publ.Bot.7:390. f.5-7. 16 My 1922,

Frondibus microscopicis in superficie hospitis
areas rugosas extensas efficientibus; filamentis
repentibus inter cellulas superficiales hospitis
penetrantibus et filamenta erecta, fasciculato-ram-
osa, fructifera et pilifera eraittentibus; cellulis
filamentorura et erectorum et repentium forma magnit-
udineque irregularibus; chromatophoris taeniatis;
zoosporangi is ignotis; gametangiis obtuse fusiformi-
bus, in filamentis erect is plurimis terminalibus,
18-24 longis, 5-6.5 y. latis; loculi uniseriatis,
in serie longitudinali quaque 4-6.

Growing on the blade of Alaria tenuifolia.

Friday Harbor, Washington. Type, Gardner, no. 4041
(Herb. Univ. Calif.,no. 207004), July.

This species, like Streblonema myrionernatoides
and S. scabiosum, has the larger part outside of the
host. It penetrates to a considerable depth among
the cells of the uninjured host, later apparently
mechanically causing the death of a few surface cells
and an abnormal growth of others, giving to the sur-
face a rugose appesarance. The plants seem to associ-
ate in small groups of indefinite shape and size,
often confluent, and, although small, can readily be
detected by the peculiar appearance they give to the
host.

f/itc V3
Ca /.

(&&?, ~ VirC.

rig. 5.

Streblonema rugosum S. and G. m– ?3

Section through the host perpendicular to its surface, showing the
papillate character caused by the presence of Streblonema. Diagrammatic.
Fig. 6. A surface view of figure 5. Diagrammatic.

Fig. 7. A section showing the structure of the Streblonema plants and their
relation to the host. X 250.

NEW VOR A

botanical

garden

Streblonema rugosum S. and G.

Fig. 5. Section through the host perpendicular to its surface, showing the
papillate character caused by the presence of Streblonema. Diagrammatic.

Fig. 6. Surface view of figure 5. Diagrammatic.

Fig. 7. Section showing the structure of the Streblonema plants and their
relation to the host. X 250.

mm 6

(ZU^r.	6Leri-m LsvŁ Z

12. Streblonema rugosum S. and G.

Plate 52, figs. 5-7

Fronds microscopic, producing decidedly rugose areas of consid-
erable extent on the surface of the host ; creeping portion penetrating
among the cells near the surface of the host, giving rise above to
fasciculately branched, erect, fructiferous filaments and hair fila-
ments; cells of creeping and erect filaments very irregular in shape
and size ; chromatophores band-shaped ; zoosporangia unknown ; game-
tangia blunt, fusiform, terminal on most of the erect filaments, 18-24^
long, 5-6.5/x broad ; loculi uniseriate, 4-6 in a series.

Growing on the blade of Alaria tenuifolia. Friday Harbor,
W a.shington.

Setchell and Gardner, Phyc. Cont. V, 1922, p. 390, pi. 43, figs. 5-7.

450

University of California Publications in Botany [Vol. 8

This species, like Streblonema myrionernatoides and S. scabiosum,
has the larger part outside of the host. It penetrates to a considerable
depth among the cells of the uninjured host, later apparently mechanic-
ally causing the death of a few surface cells and an abnormal growth
of others, giving to the surface a rugose appearance. The plants
seem to associate in small groups of indefinite shape and size, often
confluent and although small, can readily be detected by the peculiar
appearance they give to the host.

BOTANICAL

S*ard&\,

new york
botanical
garden^

ALGAE DISTRIBUTED FROM THE

ERBARIUM OF THE UNIVERSITY OF CALIFORNIA

205. Streblonema rugosum S. & G.

San Juan Island, Washington.
Co-type.

N. L. Gardner, No. 4041. July 1917.